adj. [L. cum, with; margo, edge]
(MOLLUSCA: Bivalvia)
Coinciding with the growth lines of the shell; concentric.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • concentric — adj. [L. cum, with; centrum, midpoint of a circle] Something having a common center, i.e., lines or ridges curving around a center; arcs having the same center; see comarginal …   Dictionary of invertebrate zoology

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