monacid

from The Century Dictionary.

• Capable of saturating a single molecule of a monobasic acid: applied to hydroxids and basic oxids.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Having one hydrogen atom replaceable by an acidic atom or radical.
• adjective Capable of neutralizing one equivalent of a monobasic acid; -- said of bases, and of certain metals.
• noun (Chem.) An acid having one replaceable hydrogen atom.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective chemistry Having one hydrogen atom replaceable by a negative or acid atom or radical; capable of neutralizing a monobasic acid.