One of the mysteries of the English language finally explained.
Designating or relating to prosobranch molluscs having only one gill and whose heart consists of one auricle and one ventricle (formerly placed in a suborder Monotocardia).
A monotocardian gastropod.
Early 20th century; earliest use found in Quarterly Journal of Microscopical Science. From scientific Latin Monotocardia, former suborder name + -an.
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