Not deciduate, as a placenta; not having a decidua; belonging to the Indeciduata, or non-deciduate mammals (a division comprising the Ruminantia, Edentata, and Cetacea).
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indeciduate1879
1879 tr. A. de Quatrefages de Bréau Human Species 109 Man, apes, bats, insectivora, and rodents, form a natural group to which..no indeciduate mammals can be admitted.
This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2018).