英语词源字典 - 在线词源网站

beam (v.)[beam 词源字典]: "emit rays of light," early 15c., from beam (n.) in the "ray of light" sense. Sense of "to smile radiantly" is from 1804; that of "to direct radio transmissions" is from 1927. Related: Beamed; beaming.[beam etymology, beam origin, 英语词源]
Electra: also called Laodice, a daughter of Agamemnon and Clytaemnestra, the accomplice of her brother Orestes in the murder of their mother, from Greek Elektra, literally "shining, bright," related to elektor "the beaming sun" and perhaps to elektron "amber." Especially in psychological Electra complex (1913, Jung) in reference to a daughter who feels attraction toward her father and hostility to her mother. Also the name of a daughter of Atlas, and as such a name of one of the Pleiades.
radiant (adj.): mid-15c., from Middle French radiant and directly from Latin radiantem (nominative radians) "beaming, shining," present participle of radiare "to beam, shine" (see radiation). Of beauty, etc., first attested c. 1500. Related: Radiantly.
radiate (v.): 1610s, "spread in all directions from a point," from Latin radiatus, past participle of radiare "to beam, shine, gleam; make beaming" (see radiation). Meaning "be radiant, give off rays (of light or heat)" is from 1704. Related: Radiated; radiates; radiating.
radiation (n.): mid-15c., "act or process of radiating," from Middle French radiation and directly from Latin radiationem (nominative radiatio) "a shining, radiation," noun of action from past participle stem of radiare "to beam, shine, gleam; make beaming," from radius "beam of light; spoke of a wheel" (see radius). Meaning "rays or beams emitted" is from 1560s. Meaning "divergence from a center" is 1650s.