signal

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sig·nal

(sig'năl),
1. Something that causes an action or conveys information.
2. A DNA template sequence that alters RNA polymerase transcription.
3. The end product observed when a specific sequence of DNA or RNA is deleted by some method.
4. The message transmitted on binding of an agonist to a receptor.

signal

(sĭg′nəl)
n.
Biology A physical entity, such as a chemical or an electromagnetic wave, that activates a cell receptor and elicits a specific response.
v. sig·naled, sig·naling, sig·nals or sig·nalled or sig·nalling
v.tr.
To cause an effect in (a cell) by the activation of a receptor, as by a neurotransmitter or hormone.

sig′nal·er, sig′nal·ler n.

signal

A measurable or recognisable indicator of an event or process.

signal

Medtalk A measurable or recognizable indicator of an event or process. See Magnetic resonance signal, Sexual body signal.

sig·nal

(sig'năl)
1. Something that causes an action.
2. A DNA template sequence that alters RNA polymerase transcription.
3. The end product observed when a specific sequence of DNA or RNA is deleted by some method.
4. Anything or action that communicates something.