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eido-, eid-; ido-, id- (Greek: image, figure, form, shape; literally, "that which is seen").

1. Related to or having total visual recall of anything previously seen; characterized by exact visualization of events or of objects previously seen.
2. In psychiatry, pertaining to or characterized by clear visualization (even by a voluntary act) of objects previously seen. Eidetic images (also known as primary memory images) are clearer and richer in detail than the usual memory images and are also more intense and of better quality. Except that the subject recognizes the eidetic image as a memory experience, the phenomenon is analogous to a hallucination. Visual eidetic imagery is more common than auditory.

An eidetic person can readily reproduce in his/her mind, with great accuracy and detail, what he/she has seen recently or from some past event. Eidetic imagery has been said to be one of the most important elements for the mastery of chess.

A substance that is capable of modifying the form (development) of an embryonic organ already in the process of formation.
An instrument for enlarging or reducing drawings.
Of the nature of an eidolon.
A belief in ghosts and their power to affect men.
One who demolishes idols.
1. A ghostly figure or image.
2. An idealized image of something or someone.
3. An unsubstantial image, spectre, phantom.
4. In art, a small winged figure, human or combining human with animal elements, often found in Greek vase paintings.
An Eidolon named Night
On a black throne reigns upright.

Edgar Allen Poe (1809-1849) in his poem, "Dreamland".

An instrument for measuring visual acuteness of the perception of form.
Measurement of visual perceptions.
eidos (singular), eide (plural):
1. In philosophy, form; species.
2. Idea; used by Plato.
3. The formal content of a culture, encompassing its system of ideas; criteria for interpreting experience, etc.
A contrivance for illustrating the motions of the heavenly bodies.
Shapely, comely.
idyl, idyll:
A short poem, descriptive of some picturesque scene or incident, chiefly in rustic life.
An instrument for exhibiting the phenomena of sound-waves, by means of a vibrating rod or plate having a reflector at the end.
kaleidoscope, kaleidoscopical:
An optical instrument, consisting of from two to four reflecting surfaces placed in a tube, at one end of which is a small compartment containing pieces of colored glass: on looking through the tube, numerous reflections of these are seen, producing brightly-colored symmetrical figures, which may be constantly altered by rotation of the instrument.
Of or belonging to the kaleidoscope; exhibiting brightly colored or continually varying figures like those seen in the kaleidoscope.
An instrument invented by Prof. A. E. Dolbear (West Virginia), consisting of a tube closed at one end by a tense membrane, having attached to its center a small mirror, to show the musical vibration caused by speaking or singing at the open end.
phoneidoscope, phoneidoscopic:
An instrument for exhibiting the color-figures produced by the action of sound-vibrations upon a thin film, e.g. of soap-solution.