Ichthyotomi
plural noun
Ich·thy·ot·o·mi
Definition of Ichthyotomi
: a subclass or order of Chondrichthyes comprising chiefly Carboniferous and early Permian sharks having a slender and elongated body with diphycercal tail and archipterygial fins — compare pleuracanthus
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Merriam-Webster unabridged
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