Calor

Formally equivalent to calor (“heat”), but it could instead be from a root meaning "muddy, spotted," compare caligo (“mist, vapor, fog”), Sanskrit कलंक (kalaṃka, “blemish”), Ancient Greek κελαινός (kelainós, “dark, black”).[1]

• (Classical) IPA^(key): /ˈka.lor/, [ˈkäɫ̪ɔr]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈka.lor/, [ˈkäːlor]

View of the river

Calor m sg (genitive Calōris); third declension

1. One of the most important tributaries of the Vulturnus, now called Calore.

Third-declension noun, singular only.

• “Călŏr”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• Calor in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• “Calor”, in William Smith, editor (1854, 1857), A Dictionary of Greek and Roman Geography, volume 1 & 2, London: Walton and Maberly