Mesopterygium
Pronunciation : Me*sop`te*ryg"i*um
Part of Speech : n.
Etymology : [NL., fr. Gr. (Anat.)
Definition : Defn: The middle one of the three principal basal cartilages in the fins of fishes. -- Me*sop`ter*yg"i*al, a.
Source : Webster's Unabridged Dictionary, 1913