Roget's Thesaurus: Entry 512 (Omen)

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#512. Omen.-- N. omen, portent, presage, prognostic, augury, auspice; sign &c. (indication) 550; harbinger &c. (precursor) 64; yule candle|!.

bird of ill omen; signs of the times; gathering clouds; warning &c. 668.

prefigurement &c. 511.

Adj. ill-boding.

Phr. auspicium melioris aevi[Lat][obs].