Basipterygium \Ba*sip`te*ryg"i*um\, n. [NL., fr. Gr. ba`sis a
base + ptery`gion a fin.] (Anat.)
A bar of cartilage at the base of the embryonic fins of some
fishes. It develops into the metapterygium. --
{Ba*sip`ter*yg"i*al}, a.
[1913 Webster]