Entry 1 sense Webster, 1913 Infratrochlear · In·fra·troch·le·ar · IPA /ˌɪn.fɹəˈtɹɑk.li.ɚ/ 01 a. Below a trochlea, or pulley; -- applied esp. to one of the subdivisions of the trigeminal nerve. 1. Below a trochlea, or pulley; -- applied esp. to one of the subdivisions of the trigeminal nerve.(Anat.)