Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An amount that covers the surface of the head, usually except for the face.
  • noun A relatively great amount of knowledge.

from The Century Dictionary.

  • noun As much as the head can hold.

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

  • noun An amount of information, emotion, etc. present in the mind.
  • adjective genetics That fills the head of a phage

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the quantity of information that a head will hold
  • noun a covering over the surface of your head

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

head +‎ -ful

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