"a squint," 1680s, from Modern Latin, from Greek strabismos, from strabizein "to squint," from strabos "squinting, squint-eyed." Earlier in anglicized form strabism (1650s).
strabismus stra·bis·mus (strə-bĭz'məs)
A visual defect in which one eye cannot focus with the other on an objective because of imbalance of the eye muscles. Also called heterotropia, squint, tropia.