Derive
(2 syl.) means “back to its channel or source” (Latin, de
rivo). The Latin rivus (a river) does not mean the stream or
current, but the source whence it flows, or the channel through which
it runs. As Ulpian says,
“Fons sive locus per longitudinem depressus, quo aqua decurrat. ”
Dernier Ressort
(French). A last resource.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on Derive from Fact Monster:
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 derivation  derivation derivation, in grammar: see inflection.
