Analogue

(an'-al-og). Apart or organ having the same function as another, but with a difference of structure. The correlative term, honiologue, denotes identity of structure with difference of function. The wing of the butterfly and that of the bird are analogous, but the wing of a bird and the arm of a man are homologous. A., Nonhomologous, are parts that have a similarity of function without any similarity as to relative position, e.g., the legs of a lizard and those of a lobster. A., Homologous, is used of parts that are similar both as to function and relative position, e.g., the wings of a bat and of a bird.