umbrumDictionary entriesumbra, umbrae:Feminine · Noun · 1st declensionFrequency:Frequent= shade; ghost; shadow;Entry →gen. pl.ExamplesLiber XXVIIITitus Livius (Livy) "...gregarios milites C. Albium Calenum et C. Atrium Umbrum delatum omnium consensu imperium est; qui nequaquam tribuniciis contenti..."