zygomorphicPronunciation: /ˌzʌɪgə(ʊ)ˈmɔːfɪk, ˌzɪg-/Definition of zygomorphic adjective Botany (of a flower) having only one plane of symmetry, as in a pea or snapdragon; bilaterally symmetrical. Compare with actinomorphic.Derivatives zygomorphy noun zygomorphic in other Oxford dictionaries Definition of zygomorphic in the US English dictionary