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“phlegm” in Latin

The English word phlegm itself goes back to Latin phlegma.

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

phlegm
PROP., phlegma, -atis (medical technical term): pituita (Cels.).
Figuratively, tarditas ingenii (Cic., Or., 68, 229): tarditas animi (Gell., 16, 12, 3): tarditas: inertia (Cic.): lentitudo naturalis (Ern.), patientia (Plin., Ep. 5, 21, 5).

Quick answer

What is the Latin word for phlegm?
The usual Latin words for “phlegm” are phlegma, pītuīta, tarditās; also iners, patior. 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.