Etymology
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greenhorn (n.)

mid-15c., "horn of an animal recently killed," also "young horned animal," from green (adj.) in sense of "new, fresh, recent" + horn (n.). Applied to new soldiers from c. 1650; extended to any inexperienced person by 1680s.

updated on April 17, 2015

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Definitions of greenhorn from WordNet

greenhorn (n.)
an awkward and inexperienced youth;
Synonyms: cub / rookie
From wordnet.princeton.edu, not affiliated with etymonline.