Added 9 October 2026
hemisphere
/ˈhɛmɪsfɪə/ noun
In Latin: hēmisphaerium Wiktionary
noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about hemisphere at Wordnik → Where our words come from →
Origin
From Latin hemisphaerium, from Ancient Greek ἡμισφαίριον (hēmisphaírion), from ἡμι- (hēmi-, “half”) + σφαῖρα (sphaîra, “sphere”). Equivalent to hemi- + sphere. Displaced native Old English healftrendel (literally “half-sphere”).
From Wiktionary, via Kaikki.org (CC BY-SA)