A person who practises the hobby of amateur radio. Radio amateurs must possess a licence issued by the relevant authority in the country in which they live, and must pass an exam before they can obtain a licence to operate.

plural of radio amateur

(telecommunications) A radio that creates and receives radio signals through software controlled DSPs (digital signal processors) with ADCs (analog-to-digital converters) and DACs (digital-to-analog converters).

plural of radio star

(radio) A celebrity famous for appearances in radio broadcasts.

(obsolete, astronomy) A discrete astronomical radio source

(acoustics) The impedance of any vibrating solid or fluid that radiates sound in the surrounding medium.

plural of radio-controlled car

(astronomy) a quasar / (dated) a radio-loud quasar

plural of fast radio burst