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Rfv-sense - having a single heart.
- I think it should be tagged rare, (~4 independent uses in nearly 200 years) but I've dug up a few uses:
1838, William Swainson, The natural history and classification of fishes, amphibians and reptiles, or monocardian animals:
- In prosecuting our labours upon these principles, we shall, in the first place, inquire into the station occupied by the monocardian animals in the zoological circle [...]
1980, Vera Fretter, “Observations on the gross anatomy of the female genital duct of British Littorina spp”, in Journal of Molluscan Studies, volume 46, number 2, page 148-153:
- The precise function of this membrane gland is unknown. It is presumed that it is concerned with the production of the external bounding layer of the albumen, though in other monocardians such a layer is not associated with any diverticulum
2006, Louise R. Page, “Modern insights on gastropod development: Reevaluation of the evolution of a novel body plan”, in Integrative and Comparative Biology, volume 46, number 2, page 134-143:
- Continued leftward expansion of the mantle cavity and loss of the second gill produces the monocardian condition of most extant gastropods.
- That said, I think these are referring to the second definition, having a single ventricle. As far as I'm aware, no creature exists with two separate hearts (though it's not necessarily impossible) and outside science fiction, this sense is unlikely to exist - I did find a few Doctor Who fanfics that talked about monocardial people. Smurrayinchester (talk) 20:11, 27 May 2012 (UTC)