Scrolling through the backlog, I thought this one should be fairly straightforward. In fact, the dictionaries are divided in their guidance on inflecting the verb
radio. A number of the Oxford dictionaries, like the one you use, MK, give
radioes as the spelling, but others (Collins, American Heritage, Wiktionary) say
radios. Others say nothing, which should mean the verb is regular, but what does that mean when the word ends with an
o?
The full OED gives guidance only on the paste tense and past participle: either
radioed or
radio'd. The only relevant citation uses
radios:
As soon as the observer spots a shoal of fish, he marks a square on the chart,..and at once radios to the port.
As far as usage is concerned,
radios seems to be used a lot more often than
radioes, when the word is used as a verb. Still
radioes does appear occasionally, and doesn't look wrong to me. For example a photo caption on the Canadian CBC website:
Hiding behind a tree, an RCMP spotter radioes ahead when he sees a driver illegally using a cellphone.
I agree that
radioes should be accepted, but in view of its infrequent usage, I'll make it a rare word.
