Definition of saturnine adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈsætənaɪn//
; NAmE NAmE//ˈsætərnaɪn//
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(of a person or their face) looking serious and threatening Word Originlate Middle English (as a term in astrology): from Old French saturnin, from medieval Latin Saturninus ‘of Saturn’ (identified with lead by the alchemists and associated with slowness and gloom by astrologers).
See the Oxford Advanced American Dictionary entry: saturnine