| Noun | 1. | strabismus - abnormal alignment of one or both eyesabnormalcy, abnormality - an abnormal physical condition resulting from defective genes or developmental deficiencies convergent strabismus, crossed eye, cross-eye, esotropia - strabismus in which one or both eyes turn inward toward the nose divergent strabismus, exotropia, walleye - strabismus in which one or both eyes are directed outward |