early 12c., "religious recluse," from Old French (h)eremite, from Late Latin ermita, from Greek eremites, literally "person of the desert," from eremia "desert, solitude," from eremos "uninhabited, empty, desolate, bereft," from PIE *ere- (2) "to separate" (cognates: Latin rete "net," Lithuanian retis "sieve"). Transferred sense of "person living in solitude" is from 1799. The hermit crab (1735) was so called for its solitary habits.