ribonucleate noun2 •A compound formed from the reaction of ribonucleic acid with a base.The cell wall of Gram-positive bacteria contains magnesium ribonucleate and negligible amount of lipids. — 2008 •A strand of ribonucleic acid.The phosphate end groups on the branch chains may be removed by treating the intact ribonucleate with a phosphomonoesterase which acts specifically on singly esterified phosphate groups. — 1953 formsribonucleates