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aracho-, arachi-, arachid-, araki- (Greek > Latin: legume; peanut).

A morbid fear of peanut butter sticking to the roof of one's mouth. It's related to fears of swallowing and gagging.
arachic, arachidic:
1. Pertaining to or disignating a fatty acid that is found in the form of esters in the oil of the peanut (Arachis hypogaea), in butter, etc.
2. Pertaining to or obtained from leguminous plants of the genus Arachis.
arachidonic acid:
1. In biochemistry, an unsaturated acid, obtained from lecithin; a fatty acid essential for growth of mammals, but which can be synthesized from linoleic acid; from Arachis, a generic name for the peanut.
2. Arachidonic acid is found only in animal fats, as in egg yolk and liver.
3. Coined from the modern Latin stem arachid-, "peanut" (from Greek arakhos, "a type of leguminous plant").
In chemistry, a glyceryl ester of arachic acid.
Arachis [a leguminous plant, diminutive, arakis]: In botany, a small genus of mostly Brazilian herbs of the pea family (Fabaceae). They ripen their pods underground.

Arachis hypogaea:
The common peanut; when it isn't capitalized, it's a plant of this genus.
arachis oil:
Peanut oil.