1. extracapsular surgery for cataracts in which ultrasonic sound breaks the cortex and nucleus of the lens into small fragments that are then vacuumed away through a small tube;
WordNet (r) 3.0 (2006):
phacoemulsification
n 1: extracapsular surgery for cataracts in which ultrasonic
sound breaks the cortex and nucleus of the lens into small
fragments that are then vacuumed away through a small tube