Bible Dictionaries
Protocercal

Webster's Dictionary

(a.) Having a caudal fin extending around the end of the vertebral column, like that which is first formed in the embryo of fishes; diphycercal.

Bibliography Information
Webster, Noah. Entry for 'Protocercal'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/protocercal.html. 1828.