- Zoology. having no placenta, as a monotreme or marsupial.
- an implacental mammal.
Also im·pla·cen·tate [im-pluh-sen-teyt] /ˌɪm pləˈsɛn teɪt/.
Origin of implacental
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for implacental
The air had now become suitable for mammals, both placental and implacental, and for birds.History of the Intellectual Development of Europe, Volume II (of 2)
John William Draper
Implacental, im-pla-sen′tal, adj. having no placenta, as certain marsupial animals.
- another word for aplacental
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012