Retentor

·noun A muscle which serves to retain an organ or part in place, ·esp. when retracted. ·see ·Illust. of Phylactolemata.

retentor
rĕtentor, ōris, m. [retineo], one that holds back; a detainer , retainer (post-class.), Ap. Flor....

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.