Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. In the middle of the rostrum (beak)

from The Century Dictionary and Cyclopedia

  • Pertaining to or situated upon the median line of the beak: specifically, referring to the beak or prolongation of the head of such a cetacean as a dolphin.

Etymologies

meso- +‎ rostral (Wiktionary)

Examples

  • It’s clearly a rorqual skull, and the pointed, narrow rostrum and posterior widening of the mesorostral gutter indicates that it’s a minke whale skull.

    Archive 2006-10-01

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