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hemi-head

or hem·i·head

[hem-i-hed]Automotive.
noun
  1. a cylinder head having hemispherical combustion chambers.
  2. an engine having such a cylinder head; a hemi.
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adjective
  1. of or relating to such an engine: a hemi-head V-eight.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018