ra·di·o [rey-dee-oh] noun, plural ra·di·os,adjective, verb, ra·di·oed, ra·di·o·ing.
noun
1. wireless telegraphy or telephony: speeches broadcast by radio.
2. an apparatus for receiving or transmitting radio broadcasts.
3. a message transmitted by radio.
adjective
pertaining to, used in, or sent by radio.
5. pertaining to or employing radiations, as of electrical energy.

radium (ˈreɪdɪəm) noun
a highly radioactive luminescent white element of the alkalineearth group of metals. It occurs in pitchblende, carnotite, and otheruranium ores, and is used in radiotherapy and in luminous paints.Symbol: Ra; atomic no: 88; half-life of most stable isotope, 226 Ra:1620 years; valency: 2; relative density: 5; melting pt: 700°C;boiling pt: 1140°C
b. ( as modifier ): radium needle

rafter [raf-ter, rahf-]
noun
1. any of a series of timbers or the like, usually having a pronounced slope, for supporting the sheathing and covering ofa roof.
verb (used with object)
2. British Dialect . to plow (a field) so that the soil of a furrow is pushed over onto an unplowed adjacent strip.