You searched for: “acidulous
acidulous (uh SIJ uh luhs, uh SID yoo luhs) (adjective)
Sour; acid in taste or manner; tart; harsh: an acidulous remark.

From Latin: acidus, "sour".

This entry is located in the following unit: English Words in Action, Group A + (page 4)
Word Entries at Word Info: “acidulous
acidulous
1. Acid or sour.
2. Slightly sour, sourish, sub-acid; somewhat acidic.
3. Cutting and sharp in speech or tone.