say it: RAY-dee-uht
radiate is a verb and adjective meaning "send out rays or waves". It carries 10 recorded senses.
arranged like rays or radii; radiating from a common center
“radial symmetry”
“a starlike or stellate arrangement of petals”
“many cities show a radial pattern of main highways”
having rays or ray-like parts as in the flower heads of daisies
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for radiate come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.