Webster's Revised Unabridged Dictionary · 1913

Metameric

Metameric , adjective

[Prefix meta- + Greek {not transcribed} part.]

1.
(Chemistry) Having the same molecular formula, but possessing a different bonding structure and different properties; as, methyl ether and ethyl alcohol are metameric compounds. See Isomeric.

The existence of metameric compounds is due to different arrangements of the same atoms in the molecule.

2.
(Biology) Of or pertaining to a metamere or its formation; as, metameric segmentation.