The Collaborative International Dictionary
Monkey's puzzle
Monkey's puzzle \Mon"key's puz"zle\ (Bot.) A lofty coniferous Chilian tree ( Araucaria araucana, formerly Araucaria imbricata), the branches of which are so crowded and intertwisted ``as to puzzle a monkey to climb.'' It is also called monkey puzzle and monkey puzzle tree. The edible nuts are over an inch long, and are called pi[~n]on by the Chilians.