1. (noun)beam, beam of light, light beam, ray, ray of light, shaft, shaft of light, irradiation a column of light (as from a beacon) Synonyms: beam, shaft, peter, pecker, diaphysis, radio beam, ray of light, actinotherapy, radiation, re, cock, rotating shaft, shaft of light, dick, barb, prick, electron beam, balance beam, scape, slam, spear, dig, calamus, tool, lance, radiotherapy, light beam, quill, gibe, beam of light, putz, jibe, radiation therapy, irradiation, ray, shot