Webster's English Dictionary

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nocturnal

noc.tur.nal \na:k-'t*rn-*l\ \-*l-e-\ aj [MF or LL; MF fr. LL nocturnalis, 
   fr. L nocturnus of night, nocturn]al, fr. noct-, nox night 1: of, relating 
   to, or occurring in the night {a ~ journey}  2: active at night {a ~ 
   predator}  - noc.tur.nal.ly av