col·o·bo·ma 
(kŏl′ə-bōmə)
(kŏl′ə-bōmə)n. pl. col·o·bo·ma·ta (-mə-tə)
An anomaly of the eye, usually a developmental defect, that often results in some loss of vision.
[New Latin colobōma, from Greek kolobōma, part removed in mutilation, from koloboun, to mutilate, from kolobos, maimed.]
col′o·boma·tous adj.