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ambiens

noun
am·​bi·​ens | \ˈambēˌenz\
plural ambientes\ ˌ⸗⸗ˈenˌtēz \

Definition of ambiens 

: a thigh muscle of certain birds having the tendon passing over the knee and connecting with the tendon of a muscle that bends the toes so that the body weight on perching causes the knee to bend and the feet to clasp the perch on which the bird sits

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First Known Use of ambiens

1856, in the meaning defined above

History and Etymology for ambiens

New Latin, from Latin, present participle of ambire

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The first known use of ambiens was in 1856

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