Having the same evolutionary origin but not necessarily the same function.

Roget 27: equal, even, level, monotonous, coequal, symmetrical, coordinate; on a par with, on a level with, on a footing with; up to the mark; equiparant^†.    equivalent, tantamount; indistinguishable; quits; homologous; synonymous etc. 522; resolvable into, convertible, much at one, as broad as long, neither more nor less.   ; much the same as, the same thing as, as good as; all one, all the same; equipollent, equiponderant^†, equiponderous^†, equibalanced^†; equalized etc. v.; drawn; half and half; isochronal, isochronous isoperimetric^†, isoperimetrical^†; isobath [Ocean.], isobathic [Ocean.].    ... show more

Roget 16: uniform; homogeneous, homologous; of a piece [Fr.], consistent, connatural^†; monotonous, even, invariable; regular, unchanged, undeviating, unvaried, unvarying.    unsegmented.    ... show more

Corresponding or similar in position or structure or function or characteristics; especially derived from an organism of the same species.