One of the mysteries of the English language finally explained.
Usually in plural A nautiloid cephalopod having a straight, very short septal neck; (also) a member of the obsolete cephalopod suborder Orthochoanites, of which such necks were characteristic.
Early 20th century. From scientific Latin Orthochoanites, suborder name from ancient Greek ὀρθο- ortho- + χοάνη funnel + -ίτης -ite. Compare choanite.
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