[lawng-hair, long-]Informal.
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  1. Sometimes Disparaging. an intellectual.
  2. a person, often gifted, who is very interested in or devoted to the arts, especially a performer, composer, or lover of classical music.
  3. a person having long hair, especially a hippie.
  4. a cat having long fur.
adjective Also long·haired.
  1. having long hair: a longhair cat.
  2. of or characteristic of longhairs or their tastes.

Origin of longhair

First recorded in 1915–20; long1 + hair
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for longhair

also long-hair, "cat with long hair," 1893, from long (adj.) + hair. As "intellectual," especially in musical tastes, "devotee of classical music," 1920. Sense of "hippie" attested from 1969.

Online Etymology Dictionary, © 2010 Douglas Harper