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Meaning of hemi-head

hem•i-head

Pronunciation: (hem'i-hed"), [key]
— Auto. Auto.
—n.
  1. a cylinder head having hemispherical combustion chambers.
  2. an engine having such a cylinder head; a hemi.
—adj.
  1. of or pertaining to such an engine: a hemi-head V-eight.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.