label

label /la·bel/ (la´b'l)

1. a mark, tag, or other characteristic that identifies something.

2. to provide something with such a characteristic.

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radioactive label  a radioisotope that is incorporated into a compound to mark it.

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label (lā´bl),

n 1. the portion of the prescription in which the directions for use are stated.
2. one or more characters used to identify an item of data. Also called
key. See also signa.

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label

something that identifies; an identifying mark, tag, etc.

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radioactive label

radioactive tracer.