acid phosphatase activity Catalysis of the reaction: an orthophosphoric monoester + H2O = an alcohol + phosphate, with an acid pH optimum. EC:3.1.3.2 GO:0003993 MetaCyc:ACID-PHOSPHATASE-RXN Reactome:REACT_104847 Reactome:REACT_11171 Reactome:REACT_80951 Reactome:REACT_82194 Reactome:REACT_82472 Reactome:REACT_83480 Reactome:REACT_83568 Reactome:REACT_84333 Reactome:REACT_97154 Reactome:REACT_97735 Reactome:REACT_99971 acid monophosphatase activity acid nucleoside diphosphate phosphatase activity acid phosphohydrolase activity acid phosphomonoester hydrolase activity acid phosphomonoesterase activity glycerophosphatase activity molecular_function orthophosphoric-monoester phosphohydrolase (acid optimum) phosphate-monoester phosphohydrolase (acid optimum) phosphomonoesterase activity uteroferrin