WordReference Random House Unabridged Dictionary of American English © 2026
egg′ tooth′, 
  1. Zoologya calcareous prominence at the tip of the beak or upper jaw of an embryonic bird or reptile, used to break through the eggshell at hatching.
  • 1890–95

Collins Concise English Dictionary © HarperCollins Publishers::
egg tooth
  1. (in embryo birds and reptiles) a temporary tooth or (in birds) projection of the beak used for piercing the eggshell

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