Uncertain; possibly from Proto-Italic * kailom (with a gender change to masculine), from Proto-Indo-European * kéh₂i-lom ( “ whole ” ) , originating in the augural sphere and indicating "the whole" as opposed to templum ( “ the part ” ) and cognate with Latin caelebs (and perhaps sincērus and caerimōnia ), Russian це́лый ( célyj , “ whole, intact ” ) , Proto-Germanic * hailaz . May be cognate of Oscan 𐌊𐌀𐌝𐌋𐌀 ( kaíla , “ perh. a kind of building ” ) . The shift from neuter to masculine is irregular. Kroonen, however, entirely dismisses the proposed connection between this Latin term and the Germanic forms.
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Lewis’s Elementary Latin Dictionary
1890 American Book Company edition; pinned Perseus XML digitizationcaelum
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From Proto-Italic * kaid(s)lom , from Proto-Indo-European * kh₂eyd- ( “ cut, hew ” ) (whence also caedō ( “ to cut ” ) ).
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