ba·sip·ter·yg·i·um | \ -jēəm \
plural basipterygia\ -jēə \
Definition of basipterygium
: a basal bone or cartilage forming a support of one of the paired fins of a fish:
a : a large cartilage supporting the radialia in ganoids and selachians
b : a large bone supporting the rays of a pelvic fin in teleosts
c : the posterior member of a group of three such supporting elements in certain fishes — compare mesopterygium, metapterygium, propterygium
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