What does basipterygium mean?

basipterygium in AZ Dictionary

(n) A cartilage within foot of the fins of some seafood that develops into the metapterygium upon maturity
(n) A bar of cartilage in the foot of the embryonic fins of some fishes. It develops into the metapterygium.
(n) In ichthyology, the basal bone tissue of a fin.

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