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Definition of: irritable
(ir′ə·tə·bəl) adjective
1. Showing impatience or ill temper on little provocation; irascible; petulant.
2. Biol. Responding easily to the action of external stimuli.
3. Pathol. Influenced to an abnormal degree by the action of stimulants or irritants. See synonyms under FRETFUL. [<L irritabilis <irritare]
—ir′ri·ta·bly adverb
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