omen: [16] Omen was a direct borrowing from Latin ōmen, whose derivative ōminōsus also gave English ominous [16]. From the same source comes abominable. => abominable, ominous
omen (n.)
1580s, from Latin omen "foreboding," from Old Latin osmen, of unknown origin; perhaps connected with the root of audire "to hear" [OED] or from PIE *o- "to believe, hold as true" (cognates: Greek oiomai "I suppose, think, believe").
例文
1. Her appearance at this moment is an omen of disaster.
彼女は今、災難を予告している。
2.The unusually heavy rainfall was an ill omen for the travellers.