Implacental

• (n.) A mammal having no placenta. • (a.) Without a placenta, as marsupials and monotremes.
Found on http://thinkexist.com/dictionary/meaning/implacental/

Implacental

Im`pla┬Ěcen'tal adjective (Zoology) Without a placenta, as marsupials and monotremes. -- noun A mammal having no placenta.
Found on http://www.encyclo.co.uk/webster/I/20
No exact match found