Meanings
nounhemi (plural hemis)
plural hemis
- automotiveA motor with hemispherical combustion chambers. A piston engine internal combustion engine with hemispherical piston cylinder heads.
- automotiveA combustion chamber with the hemispherical cylinder head from such an engine.
- automotiveA hemispherical cylinder head from such a motor.
- broadlyDomed versions of the above that have cylinder heads that are not exactly hemispherical
Synonyms & antonyms
engine motor
Similar
hemi engine
cylinder head
Similar
hemi head
Origin
Clipping of hemisphere.
Full word history & related roots →Rhymes & wordplay
Anagrams
Cite this entry
APA
hemi. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/hemi
MLA
“hemi.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/hemi. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “hemi,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/hemi.
Source: hemi on Wiktionary, CC BY-SA 4.0.