English
caesium
Caesium comes from Latin caesius ‘sky-blue’, from caedō ‘I cut’, and ultimately from Proto-Indo-European *kh₂eyd-.
- Proto-Indo-Europeanc. 4500–2500 BCE*kh₂eyd-‘to cut, hew’reconstructed
- Proto-Indo-European, derivedc. 4500–2500 BCE*kh₂éydetireconstructed
- Proto-Italicc. 1500–700 BCE*kaidō‘to cut, hew, fell’reconstructed
- Latinc. 75 BCE–200 CEcaedō‘I cut’
- Latin, derivedc. 75 BCE–200 CEcaesius‘sky-blue’
- Englishtodaycaesium
attested reconstructed ? uncertain or disputed deepest recorded ancestor
Lineage
- Proto-Indo-Europeanc. 4500–2500 BCE*kh₂eyd-‘to cut, hew’reconstructed
- Proto-Indo-European, derivedc. 4500–2500 BCE*kh₂éydetireconstructed
- Proto-Italicc. 1500–700 BCE*kaidō‘to cut, hew, fell’reconstructed
- Latinc. 75 BCE–200 CEcaedō‘I cut’
- Latin, derivedc. 75 BCE–200 CEcaesius‘sky-blue’
- Englishtodaycaesium
Formed from -ium
Linked words
through Proto-Indo-European *kh₂eyd- ‘to cut, hew’
through Proto-Italic *kaidō ‘to cut, hew, fell’
through Latin caedō ‘I cut’
decision, precise, cement, concise, incision, chisel, scissor, circumcision, incisive, excision, incisor, 27 more
Today it means
noun The chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal.
Language periods are conventional ranges, not dates for this word.
Etymograph / Proto-Indo-European *kh₂eyd- / caesium