LATIN DICTIONARYLexicon Latīnum
adjectivethird-declension one-termination adjective

efficāx

efficāx (genitive efficācis, adverb efficāciter)
Classical[ˈɛf.fɪ.kaːks]Ecclesiastical[ˈɛf.fi.kaks]

Meaning

  1. one terminationefficacious, effectual, powerful, efficient

Declension

singular
formmasculinefeminineneuter
nominativeefficāxefficāxefficāx
genitiveefficācisefficācisefficācis
dativeefficācīefficācīefficācī
accusativeefficācemefficācemefficāx
ablativeefficācī
efficāce		efficācī
efficāce		efficācī
efficāce
vocativeefficāxefficāxefficāx
plural
formmasculinefeminineneuter
nominativeefficācēsefficācēsefficācia
genitiveefficāciumefficāciumefficācium
dativeefficācibusefficācibusefficācibus
accusativeefficācīs
efficācēs		efficācīs
efficācēs		efficācia
ablativeefficācibusefficācibusefficācibus
vocativeefficācēsefficācēsefficācia

effĭcax, ācis, adj. efficio,
I. efficacious, effectual, powerful, efficient (mostly postAug.; not in Cic. and Caes; but cf. efficacitas): nosti Marcellum, quam tardus et parum efficax sit, Cael. ap. Cic. Fam. 8, 10, 3; cf.: ultor contemptae religionis, Val. Max. 1, 1, 19: Hercules, Hor. Epod. 3, 17: scientia (magica), id. ib. 17, 1: preces, Liv. 9, 20: studium promerendi amoris, Suet. Calig. 3 init.: breve et efficax iter est per exempla, Sen. Ep. 6, 5: admonitiones, id. ib. 8, 2 al.: herba in dolore stomachi, Plin. 27, 13, 109, § 136: preces ad muliebre ingenium, Liv. 1, 9 fin.; so with ad, Sen. Ben. 2, 7 fin.; cf. in the comp., Quint. 6, 1, 41; Plin. Pan. 84: elatine oculorum fluxionibus efficax, Plin. 27, 9, 50, § 74; so with dat., id. 28, 14, 58, § 204; in the sup.: continuatio in peragendis rebus, Liv. 41, 15: frutex efficacissimus contra sagittarum ictus, Plin. 13, 21, 36, § 115; cf.: herba adversus serpentium venena, id. 24, 15, 80, § 130: ad excitandam virtutem, etc., Vell. 1, 8, 1. —Poet., with inf.: (cadus) amara Curarum eluere efficax, Hor. C. 4, 12, 20; Val. Max. 2, 7, 10: cum sit efficacissimum de integro locum exarare, Col. 2, 17, 3: efficacissimum est hic quoque salem superponere, Cels. 4, 4, 16; 4, 22, 11.—Hence, adv.: effĭcācĭter, effectually, powerfully, Quint. 5, 13, 25; Sen. Brev. Vit. 6 et saep.—Comp., Quint. 8, 4, 8; Tac. G. 8; Plin. Ep. 6, 6, 8; Plin. 24, 6, 14, § 23.— Sup., Plin. 26, 12, 79, § 128; 24, 6, 14, § 23; id. Ep. 2, 13 fin.

Origins

  1. Proto-Indo-European*h₁éǵʰ
  2. Proto-Indo-European*h₁éǵʰs
  3. Proto-Italic*eks
  4. Latinefficāx

Latin ex- Proto-Indo-European *dʰeh₁- Proto-Indo-European *dʰeh₁k- Proto-Indo-European *-yéti Proto-Indo-European *dʰh₁kyéti Proto-Italic *θakjō Proto-Italic *fakjō Latin faciō Latin efficiō Proto-Indo-European *-eh₂ks Proto-Italic *-āks Latin -āx Latin efficāx From efficiō (“to make out, work out”) + -āx (“inclined to”).

Descendants
  • Englishefficacious
  • Frenchefficace
  • Italianefficace
  • Portugueseeficaz
  • Romanianeficace
  • Spanisheficaz

In English words that came into English from efficāx

  • efficacyefficācia
  • efficaciousefficāx

Quick answers

What does efficāx mean in Latin?
efficāx, a adjective, means “efficacious, effectual, powerful, efficient”.
How do you pronounce efficāx?
In classical Latin, [ˈɛf.fɪ.kaːks]; in ecclesiastical (church) Latin, [ˈɛf.fi.kaks].
Where does efficāx come from?
Proto-Indo-European *h₁éǵʰ → Proto-Indo-European *h₁éǵʰs → Proto-Italic *eks → Latin efficāx.