Etymology

acidulous

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Today it means: Slightly sour; subacid; sourish. Full definition →

Latin acidulus
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The story

  1. Latin · learned borrowing fromacidulus“sourish, acidulous”
  2. English todayacidulous

Learned borrowing from Latin acidulus (“sourish, acidulous”), diminutive of acidus (“sour, acid”). See acid. By surface analysis, acid + -ule + -ous.

Etymology from Wiktionary, CC BY-SA 4.0.