When you say 'crepuscular' are you speaking Latin?

'Crepuscular' is a word borrowed from Latin 'crepusculum'. The word entered the English language some time around 1668.

crepuscular [adjective] [1668]

• of, relating to, or resembling twilight
• dim
• occurring or active during twilight

See 'crepuscular' on the Loan Words Map

See more loan words from Latin.

note: Mid 17th century: from Latin crepusculum ‘twilight’.
Etymology: -

See more loan words from 1600s.