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.
[1913 Webster]