Century Dictionary and Cyclopedia
- In embryology, noting the placenta of certain mammals such as the primates (man and apes), in which the villi are restricted to a disk-shaped chorionic area on the ventral side of the embryo.
- adj. anatomy Discoidal by derivation; applied especially to the placenta of humans and apes, supposed to have been derived from a diffused placenta.
GNU Webster's 1913
- adj. (Anat.) Discoidal by derivation; -- applied especially to the placenta of man and apes, because it is supposed to have been derived from a diffused placenta.
- meta- + discoidal (Wiktionary)
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