Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A protein found in egg yolk.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A protein found in egg yolk

from the GNU version of the Collaborative International Dictionary of English

  • n. An albuminous body, belonging to the class of globulins, obtained from yolk of egg, of which it is the chief proteid constituent, and from the seeds of many plants. From the latter it can be separated in crystalline form.

from The Century Dictionary and Cyclopedia

  • n. The chief proteid constituent of the yolk of eggs.

Etymologies

vitell(us) + -in.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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