Century Dictionary and Cyclopedia
- n. One of the heart-shaped plates divided by a suture found in some fossil cephalopods, as goniatites and ammonites.
GNU Webster's 1913
- n. (Paleon.) One of a pair of shelly plates found in some cephalopods, as the ammonites.
- New Latin, from Ancient Greek for "unfolding". (Wiktionary)
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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...
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