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“jet” in Latin

The English word jet itself goes back to Latin iaciō, through iactus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

jet s.
gagates, -ae (γαγάτης). Jet black, coracino colore (of a raven-like blackness, Vitr., 8, 3, 14): niger tamquam corvus (Petronius, 43, 7; both of living things): nigerrimo colore (of a deep bright black; of persons or things): nigerrimus: perniger: omnium nigerrimus (very black; of things; perniger, Plaut., Poen., 5, 12, 153): piceus: picinus (pitch-black). Jet d’eau, aqua saliens: aquae salientes.

Quick answer

What is the Latin word for jet?
The usual Latin words for “jet” are gagātēs, Petrōnius, niger; also piceus, pĭcĭnus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.