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Definition of Leary
1. Noun. United States psychologist who experimented with psychoactive drugs (including LSD) and became a well-known advocate of their use (1920-1996). 
Definition of Leary
1. leery [adj LEARIER, LEARIEST] - See also: leery
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1. Noun. United States psychologist who experimented with psychoactive drugs (including LSD) and became a well-known advocate of their use (1920-1996). 
1. leery [adj LEARIER, LEARIEST] - See also: leery