Zoology. having the toes unlike, or unequal in number.
Ornithology. having three toes directed forward and one backward.
either of a pair of unlike , usually differing in size.
reproducing by the fusion of dissimilar gametes or individuals, usually differing in size.
the union of anisogametes. noun a type of sexual reproduction in which the gametes are dissimilar, either in size alone or in size and form anisogamy an·i·sog·a·my (ān’ī-sŏg’ə-mē) n. A union between two gametes that differ in size or form. an’i·so·gam’ic (-sə-gām’ĭk) adj.
anisognathous anisognathous an·i·sog·na·thous (ān’ī-sŏg’nə-thəs) adj. Having upper and lower jaws of unequal width, especially in the areas of the molars.