• WordNet 3.6
    • n Arachis a genus of plants with pods that ripen underground (see peanut)
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Century Dictionary and Cyclopedia
    • n arachis A small genus of leguminous plants, natives of Brazil. The genus is remarkable in the order for its elongated pedicel-like calyx-tube, and for the manner in which the growing stipe of the ovary bends downward and, attaining a length of 2 or 3 inches, pushes the ovary into the ground, where it begins to enlarge and ripen. The best-known species is A. hypogœa, the common peanut or groundnut, which is now cultivated in most warm climates, and is esteemed a valuable article of food. Its pod when mature is oblong, often contracted in the middle, wrinkled, of a pale-yellow color, and contains two seeds of the size of a nazel-nut, sweet in flavor, especially when Common Peanut (Arachis hypogæa). a, a, flowers; b, b, ovaries on lengthened stipes; c, c, forming fruit; d, ripe pod; e, pod opened, showing seeds. roasted, and yielding when pressed an oil not inferior to that of olives. The plant grows to the height of 1 or 2 feet.
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In literature:

I have just been looking at fine young pods beneath the ground of Arachis.
"More Letters of Charles Darwin Volume II" by Charles Darwin
The Arachis, or earth nut, has obtained its name from this operation.
"The Commercial Products of the Vegetable Kingdom" by P. L. Simmonds
Arachis oil enters largely into the composition of Marseilles White Soaps.
"The Handbook of Soap Manufacture" by W. H. Simmons
ARACHIS (ar'a-kis), a genus of leguminous plants much cultivated in warm climates, and esteemed a valuable article of food.
"The New Gresham Encyclopedia. Vol. 1 Part 2" by Various