A Grammatical Dictionary of Botanical Latin

Tryma,-atis (s.n.III), abl. sg. trymate: “(obsol.) an inferior drupe, with a two-valved separable flesh; as the Walnut” (Lindley); “Necker’s term for a drupaceous nut with dehiscent exocarp, as the walnut” (Jackson) [> Gk. tryma,-atos (s.n.III) a hole; dim. trymation (s.n.II; also trymE (s.f.I), a hole (Liddell & Scott)).

“Many fruits, such as the Walnut and Cocoa-nut, are sometimes termed drupes, but improperly so, as they are in reality compound, or formed originally from two or more carpels or ovaries, besides presenting other characters differing from simple fruits. (See Tryrna, page 318, and Glans, page 319.) (Bentley). Fruits with a fleshy indehiscent pericarp:

“The tryma is a superior, one-celled, one-seeded, indehiscent fruit, having a separable fleshy or leathery rind, consisting of epicarp and mesocarp, and a hard two-valved endocarp, from the inner lining of which spurious dissepiments extend so as to divide the seed into deep lobes. It differs but little from the ordinary drupe, except in being formed from an originally compound ovary. Example, the Walnut and cocoa-nut (Bentley).