Dictionary:

AMP

  (ā'ĕm-pē')

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A mononucleotide, C₁₀H₁₄N₅O₇P, found in animal cells and reversibly convertible to ADP and ATP; adenosine monophosphate. Also called adenylic acid.

[A(DENOSINE) M(ONO)P(HOSPHATE).]

Adenosine monophosphate; see adenine.

Adenosine monophosphate.

• cyclic AMP, 3′,5′-cAMP — cyclic adenosine monophosphate.

The noun has one meaning:

Meaning #1: a nucleotide found in muscle cells and important in metabolism; reversibly convertible to ADP and ATP
  Synonyms: adenosine monophosphate, adenylic acid