American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Having or designating a tail fin in which the vertebral column extends to the tip, with symmetrical upper and lower parts.
Century Dictionary and Cyclopedia
- In ichthyology, having the tail symmetrical, or consisting of equal upper and lower halves, with respect to the bones which support it, the end of the spinal column or the notochord not being bent upward as is usually the case in fishes. See homocercal, hypural, heterocercal.
- adj. zoology Describing a symmetric tail fin in which the vertebral column extends to the tip
GNU Webster's 1913
- adj. (Anat.) Having the tail fin divided into two equal parts by the notochord, or end of the vertebral column; protocercal. See protocercal.
- Greek diphuēs, double; see diphyodont + kerkos, tail + -al1. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Vertebrated but symmetrical fin (diphycercal) 170 71.”
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This quickly got bigger and weirder than originally intended, so now it's housing terms that relate to the study of dinosaurs and other prehistoric creatures. See also Dinosaurs, Pterosaurs, Ichthy...
A roster of adjectives that infrequently surface in typical conversation and writing. Many are dredged from scientific or other technical jargon or sieved from examples of disused archaic forms.
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