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Unknown. Possibly related to Ancient Greek παχύς (pakhús, thick) or from Proto-Indo-European *apó.[1]



opācus (feminine opāca, neuter opācum); first/second-declension adjective

  1. shaded, darkened; in the shade
  2. shady, dark; casting shade
  3. obscure
  4. opaque
    Synonym: obscūrus
    Antonyms: lūcidus, clārus


First/second-declension adjective.

Number Singular Plural
Case / Gender Masculine Feminine Neuter Masculine Feminine Neuter
Nominative opācus opāca opācum opācī opācae opāca
Genitive opācī opācae opācī opācōrum opācārum opācōrum
Dative opācō opācō opācīs
Accusative opācum opācam opācum opācōs opācās opāca
Ablative opācō opācā opācō opācīs
Vocative opāce opāca opācum opācī opācae opāca

Derived terms[edit]



  • opacus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • opacus”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • opacus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
  1. ^ Pokorny, Julius (1959) “apo-”, in Indogermanisches etymologisches Wörterbuch [Indo-European Etymological Dictionary] (in German), volume 1, Bern, München: Francke Verlag, pages 54-55

Further reading[edit]