https://doi.org/10.1351/goldbook.P04904
Capable of acting as a @P04906@ donor (strongly or weakly acidic as a @B00744@). The term is preferred to the synonym @P04900@ or the more ambiguous expression acidic by itself.
Source:
PAC, 1983, 55, 1281. (Glossary of terms used in physical organic chemistry) on page 1348 [Terms] [Paper]