Current definition:
like a drupe; with the character of a drupe, or prducing fruit like a drupe. Drupe = a stone-fruit (e.g. plum, cherry); a fleshy, 1-seeded indehiscent fruit with the seed enclosed in a stony endocarp
Pro parte:
SSA: drupe = an indehiscent, fleshy fruit, usually 1-seeded, in which the pericarp is clearly tripartite: a tough exocarp, a fleshy mesocarp and a hard pericarp, found e.g in plum or cherry, in Flacourtia and Ximenia and in the aggregate 'fruit' of e.g. Rubus (Rosaceae): drupaceous often refers to a fruit that is drupe-like but not strictly a drupe.
Similar concepts:
FWP: drupe = a fleshy fruit containing 1 or more seeds, each of which is surrounded by a stony layer CFFP: resembling a drupe; drupe = a fleshy fruit containing 1 or more seeds, each enclosed within a stony endocarp, as in the genus Prunus CGBT: resembling a drupe. Drupe = a fleshy fruit containing 1 or more seeds, each enclosed within a stony endocarp, as in species of the genus Prunus (Rosaceae) IPT: Resembling a drupe but morphologically not identical with 1. Drupe = a fleshy 1-seeded fruit in which the seed is enveloped by a stony endocarp (formed from part of the ovary wall). Here, as in the plum, peach, or olive, the exocarp is the 'skin', the mesocarp is the pulpy flesh, and the endocarp, the bony structure enveloping the seed; the bony endocarp plus the seed comprise the 'stone' or 'pit'.