ambitus

noun
am·bi·tus | \ˈambətəs\
plural ambitus

Definition of ambitus 

1 : the exterior edge or periphery (as of a leaf, a bivalve shell, or the test of a sea urchin)

3 : the range of a melody or voice especially : the range of a plainsong melody

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First Known Use of ambitus

1750, in the meaning defined at sense 1

History and Etymology for ambitus

Latin

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The first known use of ambitus was in 1750

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