LATIN DICTIONARYLexicon Latīnum
adjectivefirst/second-declension adjective

acidus

acidus (feminine acida, neuter acidum, comparative acidior, superlative acidissimus)
Classical[ˈa.kɪ.dʊs]Ecclesiastical[ˈaː.t͡ʃi.dus]

Meaning

  1. adjectivesour, tart, acid, bitter
  2. adjectiveharsh, grating, rough, shrill
  3. adjectivefigurativelydisagreeable, unpleasant; sharp, keen, pungent; sharp-tongued

Latīnē defined in Latin in our graded readers

Declension

singular
formmasculinefeminineneuter
nominativeacidus
acidulus		acida
acidula		acidum
acidulum
genitiveacidī
acidulī		acidae
acidulae		acidī
acidulī
dativeacidō
acidulō		acidae
acidulae		acidō
acidulō
accusativeacidum
acidulum		acidam
acidulam		acidum
acidulum
ablativeacidō
acidulō		acidā
acidulā		acidō
acidulō
vocativeacide
acidule		acida
acidula		acidum
acidulum
plural
formmasculinefeminineneuter
nominativeacidī
acidulī		acidae
acidulae		acida
acidula
genitiveacidōrum
acidulōrum		acidārum
acidulārum		acidōrum
acidulōrum
dativeacidīs
acidulīs		acidīs
acidulīs		acidīs
acidulīs
accusativeacidōs
acidulōs		acidās
acidulās		acida
acidula
ablativeacidīs
acidulīs		acidīs
acidulīs		acidīs
acidulīs
vocativeacidī
acidulī		acidae
acidulae		acida
acidula

ăcĭdus, a, um, adj. aceo,
I. sour, tart, acid.
I. Lit.: sapor, Plin. 15, 27, 32, § 106; sorba, Verg. G. 3, 380: inula, Hor. S. 2, 2, 43: lac, Plin. 28, 9, 36, § 135: caseus, ib. 9, 34, § 132: acidissumum acetum, Plaut. Ps. 2, 4, 49.—
B. Transf.
1. Like acer, from taste to sound, harsh, rough, shrill: sonus acidior, Petr. 68; cf. canticum, ib. 31.—
2. Acida creta, chalk steeped in vinegar, Mart. 6, 93.—
II. Fig., sharp, keen, pungent: homo acidae linguae, Sen. Contr. 5, 34; cf. Quint. 6, 3, 53: quod petis, id sane est invisum acidumque duobus, unpleasant, disagreeable, Hor. Ep. 2, 2, 64.—Adv.: ăcĭde, bitterly, disagreeably: non acide feras, Vulg. Ecclus. 4, 9.—Comp.: sibi acidius fuit, Petr. S. 92.

Origins

  1. Proto-Indo-European*h₂eḱ-
  2. Proto-Indo-European*h₂eḱéh₁yeti
  3. Proto-Italic*akēō
  4. Latinacidus

Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin acidus From aceō (“to be sour”) + -idus.

Descendants
  • Catalanàcid
  • Englishacid
  • Frenchacide
  • Romanianacidfrom French acide
  • Italianacido
  • Portugueseácido
  • Sardinianaxedu
  • Spanishácido
  • Danishacido
  • Turkishasitfrom French acide

Quick answers

What does acidus mean in Latin?
acidus, a adjective, means “sour, tart, acid, bitter; harsh, grating, rough, shrill; disagreeable, unpleasant”.
How do you pronounce acidus?
In classical Latin, [ˈa.kɪ.dʊs]; in ecclesiastical (church) Latin, [ˈaː.t͡ʃi.dus].
Where does acidus come from?
Proto-Indo-European *h₂eḱ- → Proto-Indo-European *h₂eḱéh₁yeti → Proto-Italic *akēō → Latin acidus.