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Iso Words: “geoisotherm” to “isohyetal”,
Part 1 of 2.

iso-, is- (Greek: equal; by extension: same, similar, alike; normally used as a prefix.

Used in numerous terms, nearly all scientific; denoting: equality, similarity, uniformity, or identity; the second element being properly and usually of Greek origin, rarely of Latin [the proper prefix in the latter case being equi-]. In biology, denoting for or from different individuals of the same species). For a large list of iso- opposites or antonyms, see aniso-.

An underground isotherm.
1. Applied to a curve passing through those points (in a theater, concert-room, etc.) at which a speaker or performer may be heard equally well.
2. In seismology, applied to a line (imaginary or on a map) connecting places where an equal percentage of observers heard the sound of an earthquake.
In botany, having diadelphous stamens with the same number in each bundle.
A line on a weather chart connecting points of equal change of atmospheric pressure within a specified time period commonly used on synoptic surface charts to depict three-hourly local pressure tendencies.
Of or relating to equal or constant pressure change, referring specifically to either the distribution of equal pressure tendency in space or the constancy of pressure tendency with time.
A line on a weather chart connecting points of equal change of temperature within a specified time period.
In botany, of a flower, having stamens that are alike and are of a quantity equal to the number of petals.
isanthous, isantherous:
Bearing symmetric flowers.
isoagglutination, isoagglutinative:
Agglutination (clumping together) of an agglutinogen (usually red blood cells) of one individual (human or animal) by the serum of another of the same species.
isobar, isobaric:
1. A line connecting places on the earth’s surface having the same barometric pressure at a given time or for a given period.
2. A line on a chart or map connecting points of equal atmospheric or hydrostatic pressure.
1. Having the same depth; of equal depth.
2. A line (either imaginary or on a map) joining places where water has equal depth; an underwater (bathymetric) contour.
isobathytherm, isobathythermal:
A line connecting points having the same temperature in a vertical section of any part of the sea (also isothermobath).
Having the two sides equal and alike; applied to bilaterally symmetrical leaves in which there is no evident distinction of upper and under surface, as in some species of Iris.
A boundary line on a map connecting world environments that have similar floral and faunal constituents.
Producing equal amounts of vital energy.
Binary digits having the same value.
isobryous, isobrious:
In botany, growing with equal vigor on both sides; applied to a dicotyledonous embryo.
A line drawn through geographical points at which a given phase of thunderstorm activity ooccurred simultaneously.
A state in which the arterial carbon dioxide pressure remains constant or unchanged.
isocarpic, isocarpous:
Having the same number of carpels (pistils) and perianth (petal) divisions.
isocephalic, isocephalous, isocephalic:
In art, having the heads of the principal figures (whether seated, or standing, or mounted on horses) arranged in one horizontal line or nearly so; said especially of Greek bas-reliefs and friezes.
isoceraunic, isokeraunic:
Indicating or having equal frequency or intensity of thunderstorm activity. An isoceraunic line is a line drawn through geographical points at which some phenomenon connected with thunderstorms has the same frequency or intensity; used for lines of equal frequency of lightning discharges.
A line connecting points on the earth’s surface at which the aurora is observed with equal frequency.
isocheime, isochime:
A line connecting places on the earth’s surface having the same mean winter temperature.
1. Of uniform color.
2. Denoting two objects of the same color.
3. In optics, having the same color.
isochronal, isochronous:
1. Acting in uniform time, or taking place at regular intervals.
2. Equal in time; contemporary; occurring during the same time.
A line on a chart connecting all points having the same time of occurrence of particular phenomena or of a particular value of a quantity.
The correspondence of events with respect to time, rate, or frequency.
isochronic, isochronism:
1. Not varying in time; occurring at the same time or at a regular time.
2. Having the characteristics of a uniform rate of operation or periodicity; for example, as a pendulum or watch balance.
A clock designed to keep very accurate time.
isoclinal, isoclinic:
Inclining in the same direction; of or relating to an equal direction of inclination for various items.
Equality of size of both pupils of the eyes.
Equality of power or rule; a system of government in which all the people possess equal political power.
A line connecting points on the earth’s surface at which the temperature is the same during a specified coldest period of the year.
A condition of having fingers (or toes) of equal length.
isodactylous, isodactyly:
In zoology, having the fore and hind toes or digits equal or alike.
1. Pertaining to populations composed of an equal number of individuals.
2. Lines on a map that pass through points representing equal population densities.
Having equal diameters.
isodont, isodontous:
1. Possessing all teeth of the same size and shape.
2. Of a snake, having maxillary teeth of the same size.
3. In zoology, having the teeth all alike, as some cetaceans.
A method of moving a fleet of ships from one formation to another by means of paths of equal length for each ship.
A line on a weather chart connecting locations having equal dew points.
A state of being of equal strength or power.
isodynamic, isodynamical:
1. Describing equal forces or forces that remain constant with time.
2. Relating to foods or other materials that liberate the same amount of energy on combustion.
3. Describing an imaginary surface on which force is everywhere the same.
3. Indicating equal (magnetic) force; applied to lines connecting points (of the earth’s surface, etc.) at which the intensity of the magnetic force is the same; or to a map or chart on which such lines are marked.
Applied to a line on a radar display along which the echo signal (from clouds and the like) has the same strength, and to devices and techniques relating to such lines (as in the detection of rain and atmospheric turbulence).
Having, denoting, or giving rise to equal amounts of energy; taking place at constant energy.
isogamy, isogamous:
A reference to gametes that are equal in size and similar in structure in both sexes. Among animals the male gametes are known as spermatozoa and the female gametes as eggs or ova.
1. Having identical genotypes.
2. Of a tissue graft, involving a genetically identical host and donor.
1. Of the same origin.
2. Used to describe bodily organs or parts that have the same or a similar origin.
isogeotherm, isogeothermal, isogeothermic:
A line or surface (usually imaginary) connecting points in the interior of the earth having the same temperature; an isogeothermal line.
1. In linguistics, a speech area in which a line between places that delimits any feature of language; such as, pronunciation, inflection, vocabulary, or syntax is shown.
2. The geographical range of a given word, pronunciation, or usage.
Having the molar teeth alike in both jaws.
A figure having equal angles.
Having equal angles, equiangular.
Having , or pertaining to, equal angles.
1. A tissue graft involving a genetically identical host and donor.
2. A graft taken from an identical twin of the recipient or from an animal of the same inbred strain.
A proposed general term for lines on a diagram, etc. indicating equality of some physical condition or quantity, as isotherms, isobars, etc.
isography, isographic:
Imitation of another’s handwriting; reproducing the same penmanship of someone else.
In cartography, a line on a map or chart drawn through all points on the earth’s surface that have equal grivation (grid variation).
Having pistils or carpels equal in number to the parts of the perianth.
A line (imaginary or on a chart), or an imaginary surface, connecting points that have the same or equal salinity.
A line on a map or chart connecting points at which the waters of the sea have an equal degree of saltiness.
isohel, isohelic:
A line (imaginary or on a map) connecting points having the same amount or duration of sunshine.
isohyetal, isohyetose:
A line on a map, etc., connecting places having equal annual or seasonal rainfall.