whodunit (iou) and oxygen radioisotopes (medicine)

whodunit (iou)

whodunit noun. colloq. Also whodunnit. M20.

A story, play, etc., about the detection of a crime etc., esp. a murder.
whodunitry, whodunnitry noun Writing or subject matter characteristic of a detective story M20.

oxygen radioisotopes (medicine)

oxygen radioisotopes

Unstable isotopes of oxygen that decay or disintegrate emitting radiation. O atoms with atomic weights 13, 14, 15, 19, and 20 are radioactive oxygen isotopes.

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