1. n. [Drilling]

The working platform approximately halfway up the derrick or mast in which the derrickman stores drillpipe and drill collars in an orderly fashion during trips out of the hole. The entire platform consists of a small section from which the derrickman works (called the monkeyboard), and several steel fingers with slots between them that keep the tops of the drillpipe in place.

See related terms: drill collar,  monkeyboard,  racking back pipe,  round trip,  stand,  trip out