n. [ See Metamere. ] (Chem.) Any one of several metameric forms of the same substance, or of different substances having the same composition; as, xylene has three metamers, viz., orthoxylene, metaxylene, and paraxylene; an isomer. [ 1913 Webster ]

n. [ Pref. meta- + -mere. ] (Biol.) One of successive or homodynamous parts in animals and plants; one of a series of similar parts that follow one another in a vertebrate or articulate animal, as in an earthworm; a segment; a somite. See Illust. of Loeven's larva. [ 1913 Webster ]

a. [ Pref. meta- + Gr. &unr_; part. ] 1. (Chem.) 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. [ 1913 Webster ]

☞ The existence of metameric compounds is due to different arrangements of the same atoms in the molecule. [ 1913 Webster ]

2. (Biol.) Of or pertaining to a metamere or its formation; as, metameric segmentation. [ 1913 Webster ]

adv. In a metameric manner. [ 1913 Webster ]

n. 1. (Biol.) The symmetry of a metameric structure; serial symmetry; the state of being made up of metameres. [ 1913 Webster ]

2. (Chem.) The state or quality of being metameric; isomerism due to different bonding patterns in two substances having the same molecular formula. Contrasted with steroisomerism or optical isomerism. Also, the relation or condition of metameric compounds. [ 1913 Webster ]