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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Amniote
is always a great word to know.
So is quincunx. Does it mean:
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a gadget; dingus; thingumbob. |
Collins
World English Dictionary
| amniote (ˈæmnɪəʊt) | |
| —n | |
| Compare anamniote any vertebrate animal, such as a reptile, bird, or mammal, that possesses an amnion, chorion, and allantois during embryonic development | |
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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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
amniote  (ām'nē-ōt') Pronunciation Key
Any of the vertebrates that have an amnion during embryonic development. Reptiles, birds, and mammals are amniotes. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia
amniote
a group of limbed vertebrates that includes all living reptiles (class Reptilia), birds (class Aves), mammals (class Mammalia), and their extinct relatives and ancestors. The amniotes are the evolutionary branch (clade) of the tetrapods (superclass Tetrapoda) in which the embryo develops within a set of protective extra-embryonic membranes-the amnion, chorion, and allantois.
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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