| a cyclic anhydride of guanosine monophosphate formed from guanosine triphosphate by the action of guanylate cyclase: in cellular metabolism, it acts as a second messenger associated with increased cell division and growth. |

| cyclic GMP n. A cyclic nucleotide of guanosine that acts at the cellular level to regulate various metabolic processes and mediate the action of certain hormones, possibly as an antagonist to cyclic AMP. |
cyclic GMP n.
A cyclic nucleotide of guanosine that acts at the cellular level as a regulator of various metabolic processes, possibly as an antagonist to cyclic AMP.