noun. A fleshy fruit, such as a peach, plum, or cherry, usually having a single hard stone that encloses a seed.

noun. In botany, a stone-fruit; a fruit in which the outer part of the pericarp becomes fleshy or softens like a berry, while the inner hardens like a nut, forming a stone with a kernel, as the plum, cherry, apricot, and peach.

noun. A fruit consisting of pulpy, coriaceous, or fibrous exocarp, without valves, containing a nut or stone with a kernel. The exocarp is succulent in the plum, cherry, apricot, peach, etc.; dry and subcoriaceous in the almond; and fibrous in the cocoanut.

noun. A stone fruit.

noun. fleshy indehiscent fruit with a single seed: e.g. almond; peach; plum; cherry; elderberry; olive; jujube

"From wikipedia: In botany, a drupe is a fruit in which an outer fleshy part (exocarp, or skin; and mesocarp, or flesh) surrounds a shell (the pit or stone) of hardened endocarp with a seed inside."