Slang. an amphetamine pill, especially one that is green in color.
Australian Slang. a conservationist or environmentalist, especially one who participates in protest demonstrations.

1945–50, for def 1; green + -ie Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
greenie (ˈɡriːnɪ)
informal (Austral) a conservationist

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

greenie green·ie (grē'nē)
An amphetamine pill that is green in color.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But one kind of super green greenie proves the exception.
Every time an article on nuke energy appears there is always some low information greenie that pretends he is an expert.
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