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