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fossa1

[fos-uh] /ˈfɒs ə/
noun, plural fossae
[fos-ee] /ˈfɒs i/ (Show IPA).
Anatomy.
1.
a pit, cavity, or depression, as in a bone.
Origin of fossa1
1820-1830
1820-30; < Latin: ditch, trench, fosse, short for fossa (terra) dug or dug out (earth), noun use of feminine of fossus, past participle of fodere to dig

fossa2

[fos-uh] /ˈfɒs ə/
noun
1.
a forest-dwelling genetlike mammal, Cryptoprocta ferox, of the civet family, native to Madagascar, with a short coat of white, black, gray, or brown: now rare.
Also called fossa cat.
Origin
1830-40; < Malagasy; compare earlier fossane (< French < Malagasy)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for fossa

fossa1

/ˈfɒsə/
noun (pl) -sae (-siː)
1.
an anatomical depression, trench, or hollow area
Word Origin
C19: from Latin: ditch, from fossus dug up, from fodere to dig up

fossa2

/ˈfɒsə/
noun
1.
a large primitive catlike viverrine mammal, Cryptoprocta ferox, inhabiting the forests of Madagascar: order Carnivora (carnivores). It has thick reddish-brown fur and preys on lemurs, poultry, etc
Word Origin
from Malagasy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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fossa in Medicine

fossa fos·sa (fŏs'ə)
n. pl. fos·sae (fŏs'ē')
A small longitudinal cavity or depression, as in a bone.

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