Section M, N, and O

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"Section M, N, and O"

[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.

Met"a*mere (?), 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.

Met`a*mer"ic (?), a. [Pref. meta-
+ Gr. &?; part.] 1. (Chem.) Having
the same elements united in the same proportion by weight, and with
the same molecular weight, but possessing a different structure and
different properties; as, methyl ether and ethyl alcohol are
metameric compounds. See Isomeric.

&fist; The existence of metameric compounds is due to the
different arrangement of the same constituents in the molecule.

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

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"Section M, N, and O"