noun, plural dentaries. Zoology.
one of a pair of membrane bones that in lower vertebrates form the distal part of the lower jaws and in mammals comprise the mandible.

1820–30; < Latin dentārius of the teeth, equivalent to dent- (stem of dēns) tooth + -ārius -ary Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences for dentary
The dentary gradually becomes the main bone of the lower jaw.
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