1865-70; < Latinexarātus (past participle of exarāre to plow up). See ex-1, arable, -ate1
British Dictionary definitions for exarate
exarate
/ˈɛksəˌreɪt/
adjective
1.
(of the pupa of such insects as ants and bees) having the legs, wings, antennae, etc, free and movable
Word Origin
C19: from Latin exārātus, literally: ploughed up (apparently referring to the way this type of pupa throws off the larval skin), from exārāre, from ārā plough