allogamyBot.|æˈlɒgəmɪ| [mod.f.Gr. ἄλλος other, different + -γαµία marrying, f. γάµος marriage.] Cross-fertilization. 1879in Syd. Soc.Lex.1880Gray Struct.Bot. vi. §4. 216 Cross fertilization, or Allogamy, the action of the pollen of one flower on the pistil of some other flower of the same species.