[ noun ]
nut having a hard hazel-brown shell used like vegetable ivory
<noun.plant>

Coquilla nut \Co*quil"la nut\ [Pg. coquilho, Sp. coquillo, dim.
of coco a cocoanut.] (Bot.)
The fruit of a Brazilian tree ({Attalea funifera} of
Martius.).

Note: Its shell is hazel-brown in color, very hard and close
in texture, and much used by turners in forming
ornamental articles, such as knobs for umbrella
handles.