radiant /ˈɹeɪ.di.ənt/adjective 7noun 3forms 3 adjective7 •Radiating light and/or heat.They in ranks / Sat all, where stood the fiery steeds of each, / And where his radiant arms lay on the field. — 1791 •Giving off rays. •(figurative) Beaming with vivacity and happiness.Nurse Cramer had a cute nose and a radiant, blooming complexion dotted with fetching sprays of adorable freckles that Yossarian detested. — 1961 •(figurative) Strikingly beautiful. •Emitted as radiation. •Emitting or proceeding as if from a center. •Having a ray-like appearance, like the large marginal flowers of certain umbelliferous plants; said also of the cluster which has such marginal flowers. noun3 •A point source from which radiation is emitted. •The apparent origin, in the night sky, of a meteor shower. •A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve. formsradiants · more radiant · most radiant