LATIN DICTIONARYLexicon Latīnum
adjectivefirst/second-declension adjective (nominative masculine singular in -er)

āter

āter (feminine ātra, neuter ātrum, comparative ātrior, superlative āterrimus)
Classical[ˈaː.tɛr]Ecclesiastical[ˈaː.ter]
Mille Verba core vocabulary

Meaning

  1. adjectivedull black (as opposed to niger, shining black); dark
  2. adjectivegloomy, sad, dismal, unlucky
  3. adjectivepoeticraremalevolent
  4. adjectivepoeticobscure

Latīnē defined in Latin in our graded readers

niger sine lūce; color noctis et mortis.
āter ātra ātrum — in Mille Verba, Colōrēs

Choosing the right word Döderlein's Latin Synonyms

Ater · Niger · Pullus

1. Ater (αἰθός) denotes black, as a negation of color, in opp. to albus; whereas niger (πνιγόεις) denotes black, as being itself a color, and indeed the darkest, in opp. to candidus. The atrum makes only a dismal and dark impression; but the nigrum, a positive, and imposing and beautiful impression, as Hor. Carm. i. 32, 11. Lycum nigris oculis, nigroque crine decorum. Tac. G. 43. Nigra scuta, tincta corpora; atras ad prœlia noctes legunt. (iii. 194.) 2. Ater and niger denote a deep dark black; whereas pullus only swarthy, with reference to the affinity of the dark color to dirt. (iii. 207.)

Declension

singular
formmasculinefeminineneuter
nominativein -er
āter
ātraātrum
genitiveātrīātraeātrī
dativeātrōātraeātrō
accusativeātrumātramātrum
ablativeātrōātrāātrō
vocativeāterātraātrum
plural
formmasculinefeminineneuter
nominativeātrīātraeātra
genitiveātrōrumātrārumātrōrum
dativeātrīsātrīsātrīs
accusativeātrōsātrāsātra
ablativeātrīsātrīsātrīs
vocativeātrīātraeātra

āter, tra, trum, adj. cf. αἴθω, to burn; Sanscr. idh; αἴθων αἰθήρ, Αἴτνη, Aetna, aether, aestus, aestas (pr. burnt black, black as a coal; cf.:
I. Tam excoctam reddam atque atram quam carbost, Ter. Ad. 5, 3, 63: hence), black; and specif., coalblack, lustreless-black, sable, dark (opp. albus, lustreless-white, and diff. from niger, glossy black, v. albus init.; class. and freq., but never in Vulg., which uses niger).
I. Lit.: album an atrum vinum potas? Plaut. Men. 5, 5, 17: atrior multo Quam Aegyptii, id. Poen. 5, 5, 11: alba et atra discernere non poterat, Cic. Tusc. 5, 39, 114: nigra scuta, tincta corpora; atras ad proelia noctes legunt, Tac. G. 43: Mos erat antiquus niveis atrisque capillis, etc., Ov. M. 15, 41; so id. ib. 15, 44; cf. albus: fauces, Lucr. 6, 1147: dens, Hor. Epod. 8, 3: nubes, Lucr. 6, 180; Hor. C. 2, 16, 2: lumen, with smoke, Verg. A. 7, 457: agmen, with dust, id. ib. 12, 450 Serv.: axis, with blood, Sil. 2, 186: Eridanus ater stragibus, id. 6, 107: bilis, Plaut. Capt. 3, 4, 64, and Cic. Tusc. 3, 5, 11 (cf. the Gr. μελαγχολία): cruor, Hor. Epod. 17, 31: tempestas, Lucr. 6, 258 sq.; Verg. A. 5, 693: hiemps, id. ib. 7, 214: canis, Ter. Phorm. 4, 4, 25: corvus atro gutture, Cat. 108, 5: venena, Verg. G. 2, 130: Tartara, Lucr. 3, 966; so, Cocytus, Hor. C. 2, 14, 17: mare, dark, stormy, id. S. 2, 2, 16: fluctus, Verg. A. 5, 2: mons, v. 2. ater.— The proverb albus an ater, v. albus.—Poet., = atratus, clothed in black: lictores, Hor. Ep. 1, 7, 6; cf. albus, I. B. 2.—
II. Trop.
A. In gen., black, dark, gloomy, sad, dismal, unfortunate, etc.: funus, Lucr. 2, 580: formido, id. 4 [173], and id. 6, 254; so, Timor, Verg. A. 9, 719: cupressus, id. ib. 3, 64: dies, id. ib. 6, 429; Prop. 3, 2, 4: mors, Hor. C. 1, 28, 13: fila trium sororum, id. ib. 2, 3, 16: Esquiliae (as a burying-place), dismal, id. S. 2, 6, 32: seu mors atris circumvolat alis, id. ib. 2, 1, 58: cura, id. C. 3, 1, 40; 3, 14, 13; 4, 11, 35: lites, id. A. P. 423: comes, id. S. 2, 7, 115: serpens, Verg. G. 1, 129; Ov. M. 3, 63 al.: genius .. vultu mutabilis, albus et ater, Hor. Ep. 2, 2, 189.—In Roman civil life, dies atri are the days on which the state experienced some calamity, unlucky days. (This designation is said to have arisen from the Roman custom of marking every unfortunate day in the calendar with coal); Varr. L. L. 6, § 29; Liv. 6, 1; Gell. 5, 17; Fest. s. v. nonarum, p. 179 Müll.; id. s. v. religiosus, p. 278 Müll.; Ov. A. A. 1, 418; Macr. S. 1, 15 fin. and 16; Afran. ap. Non. p. 73, 33: si atro die faxit insciens, probe factum esto, Liv. 22, 10.—
B. Esp.
1. Rare and poet., of mind or feeling, malevolent, malicious, virulent (cf. niger, II. D., and the Gr. μέλας, II. 4 Lidd. and Scott): versus, Hor. Ep. 1, 19, 30: si quis atro dente me petiverit, id. Epod. 6, 15.—
2. Also poet. of something difficult to be understood, dark, obscure (so μέλας, Anth. Pal. 11, 347): latebrae Lycophronis atri, Stat. p. 5, 3, 157.—Comp. v. supra, I.—Sup. and adv. not used.
Āter mons,
I. a mountain in the interior of Africa, north of Phazania (Fezzan), Plin. 5, 5, 5, § 35.

Origins

From Proto-Italic *ātros, from Proto-Indo-European *h₂eh₁ter- (“fire”) (whence Proto-Iranian *HáHtr̥š (“fire”), Umbrian 𐌀𐌕𐌓𐌖 (atru), Oscan 𐌀𐌀𐌃𐌝𐌓𐌉𐌉𐌔 (aadíriis), Old Irish áith (“kiln”)).

Descendants
  • Frenchâtre
  • Italianatro
  • Portugueseatro
  • Spanishatro

Quick answers

What does āter mean in Latin?
āter, a adjective, means “dull black (as opposed to niger, shining black); dark; gloomy, sad, dismal, unlucky”.
How do you pronounce āter?
In classical Latin, [ˈaː.tɛr]; in ecclesiastical (church) Latin, [ˈaː.ter].