[ey-pluh-sen-tl, ap-luh-]
adjective Zoology.
having or forming no placenta, as the marsupials and monotremes.

1855–60; a-6 + placental

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World English Dictionary
aplacental (ˌeɪpləˈsɛntəl, ˌæplə-)
(of monotremes and marsupials) having no placenta

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

aplacental a·pla·cen·tal (ā'plə-sěn'tl)
Having no placenta.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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