opaca
opaca is a Latin form of opacus, meaning “shady, shaded; dark”. It is the ablative singular feminine adjective or nominative singular feminine adjective.
Found 53 times in the Latin texts on Socratos.
Where it is used
Vergil, Aeneid 2.725: pone subit coniunx: ferimur per opaca locorum;
Seneca the Younger, Agamemnon 1: Opaca linquens Ditis inferni loca
All forms of opacus (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.