pale colouring of the face, especially because of illness or fearHer cheeks had an unhealthy pallor.He had a sickly pallor.the deathly pallor of her faceOxford Collocations Dictionaryadjectivedeathly,sicklyverb + pallorhaveSeefull entrySee related entries:Being illWord Originlate Middle English: from Latin, from pallere ‘be pale’.
See pallor in the Oxford Advanced American Dictionary