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Webster's New World College Dictionary » irritable
irritable 
irritable definition
ir·ri·table (ir′i tə bəl)
adjective
- easily annoyed or provoked; fretful
- Med. excessively or pathologically sensitive to a stimulus
- Physiol. able to respond to a stimulus
Etymology: L irritabilis < irritare, to irritate
Related Forms:
- irritability ir′·ri·tabil′·ity noun or irritableness ir′·ri·table·ness
- irritably ir′·ri·tably adverb
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