Definitions

from The Century Dictionary.

  • noun A rudimentary vertebra which in some animals precedes the atlas proper.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Anat.) A vertebral rudiment in front of the atlas in some reptiles.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun anatomy A vertebral rudiment in front of the atlas in some reptiles.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pro- +‎ atlas

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