Mesopterygial
Mesopterygium Me*sop`te*ryg"i*um, n. [NL., fr. Gr. me`sos middle + ? a fin.] (Anat.) The middle one of the three principal basal cartilages in the fins of fishes. -- {Me*sop`ter*yg"i*al}, a. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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