morphology noun mor??phol??o??gy \mo??r-??f??l-??-j??\ (Medical Dictionary)plural mor??phol??o??giesMedical Definition of MORPHOLOGY 1: a branch of biology that deals with the form and structure of animals and plants especially with respect to the forms, relations, metamorphoses, and phylogenetic development of organs apart from their functions???see anatomy 1; compare physiology 1 2: the form and