acidhead

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ac·id·head

 (ăs′ĭd-hĕd′)
n. Slang
A person who uses LSD.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

acidhead

(ˈæsɪdˌhɛd)
n
(Recreational Drugs) slang a person who uses LSD
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ac′id•head`

(ˈæs ɪdˌhɛd)

n. Slang.
a person who habitually takes the drug LSD.
[1965–70]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Translations

acidhead

n (inf: = LSD user) → Acidhead m (sl)
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
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References in periodicals archive
Behind it all is an "Indo-Chinese" drug cartel, a stand-in for the Vietnam War and ultimately a front for whatever cosmic antiplan you like--Doc Sportello being a sort of acidhead Don Quixote complete with intermittent sidekick, maritime lawyer Sauncho Smilax (Benicio Del Toro).
Splendor in the Grass: J. Hoberman on Paul Thomas Anderson's inherent vice
As an old acidhead joke goes, LSD is a highly volatile drug that can induce heart palpitations, panic, and paranoia--in those who have never taken it.
Dead end kids on acid: a business history of LSD
Military strategist Herman Kahn of the RAND Corporation was also a heavy Army acidhead. He insisted that during one particularly heavy trip when he seemed to be just lolling about on the floor muttering "wow, he was really quietly reviewing potential bombing strategies against Red China.)
Come hear Uncle Sam's band: the hippie capitalism of the Grateful Dead
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