Pregnancy often takes place in a unicorn or bicorn uterus, leading to similar anomalous conditions.
"Anomalies and Curiosities of Medicine" by George M. Gould
They are necessarily of two kinds: the unicorns and the bicorns.
"The Physiology of Marriage, Complete" by Honore de Balzac
He wore a grey redingote and a shabby bicorne hat.
"The Bronze Eagle" by Emmuska Orczy, Baroness Orczy
Thanks to the lateral point of the stone anvil, which served the part of the conoid bicorn, he was able to forge rings rude in shape but strong.
"Toilers of the Sea" by Victor Hugo