umber UK /ˈʌmbə/US /ˈʌmbɚ/noun 3adjective 1verb 1forms 3 noun3 •A brown clay, somewhat darker than ochre, which contains iron and manganese oxides.They instructed the upholsterer to do the sofa in cinnamon and the ottoman in umber. •A grayling. •A dusky brown African wading bird (Scopus umbretta) allied to the shoebill and herons; a hamerkop. adjective1 •Of a reddish brown colour, like that of the pigment.Their harps are of the umber shade / That hides the blush of waking day. — 1819 verb1 •To give a reddish-brown colour to.Armies o'er armies heap'd, the locusts came, Like clouds in autumn umbering all the sky […] — 1807 formsumbered · umbering · umbers