from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A member of the Monotremata, an order of primitive egg-laying mammals restricted to Australia and New Guinea and consisting of only the platypus and the echidna.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mammal that lays eggs and has a single urogenital and digestive orifice. Only the echidnas and platypuses are included in this group.
- adj. Having a single trema, or aperture
from the GNU version of the Collaborative International Dictionary of English
- n. One of the Monotremata.
from The Century Dictionary and Cyclopedia
- Same as monotrematous: as, monotreme mammals; a monotreme egg.
- n. A member of the Monotremata, as a duck-mole or prickly ant-eater.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the most primitive mammals comprising the only extant members of the subclass Prototheria
From New Latin Monotrēmata, order name : mono- + Greek trēma, trēmat-, perforation.(American Heritage® Dictionary of the English Language, Fourth Edition)
mono- + -treme (Wiktionary)