Pinon \Pi[~n]"on\, n. [Sp. pi[~n]on.]

(Bot.)
   (a) The edible seed of several species of pine; also, the tree producing such seeds, as Pinus Pinea of Southern Europe, and P. Parryana, cembroides, edulis, and monophylla, the nut pines of Western North America.
   (b) See Monkey's puzzle. [Written also pignon.]

Source: Webster's Revised Unabridged Dictionary (1913)