[plat-i-puhs, -poos]
noun, plural platypuses, platypi [plat-i-pahy] .
a small, aquatic, egg-laying monotreme, Ornithorhynchus anatinus, of Australia and Tasmania, having webbed feet, a tail like that of a beaver, a sensitive bill resembling that of a duck, and, in adult males, venom-injecting spurs on the ankles of the hind limbs, used primarily for fighting with other males during the breeding season.
Also called duckbill, duckbilled platypus.

1790–1800; < Neo-Latin < Greek platýpous flat-footed, equivalent to platy- platy- + -pous, adj. derivative of poús foot Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
platypus (ˈplætɪpəs)
n , pl -puses
See duck-billed platypus
[C18: New Latin, from platy- + -pus, from Greek pous foot]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1799, from Mod.L., from Gk. platypous, lit. "flat-footed," from platys "broad, flat" (see place (n.)) + pous "foot."
"Orig. the generic name, but, having already been given to a genus of beetles, it was in 1800 changed for Ornithorhyncus." [OED]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The platypus and alligator are remnants of these transitions.
As you're following the river, look out for platypus, fish and turtles from the
  viewing deck.
Human sleep could develop as far beyond typical mammalian sleep as human
  thought transcends the platypus'.
The platypus of audio-video waddled ashore recently.
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