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A contrail thought to contain a chemical agent that a government is dispersing as part of a conspiracy.

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.
References in periodicals archive ?
File these altitudes to keep the chemtrail fanatics busy!
After the Purple Rain singer's death, theorists claimed he may have been murdered because he spoke of a "chemtrail" conspiracy theory that the US government controlled the population by spraying it.
The article "Stolen Skies: The Chemtrail Mystery" (EIJ, Summer 2002), contained many inaccuracies which deserve correction.
I keep stumbling on websites about chemtrails and I'm starting to think I could quite easily become sympathetic to the chemtrail theorists' cause.
Thanks for publishing Stolen Skies: The Chemtrail Mystery.
The term chemtrail is derived from "chemical trail" and refers to aerial trails al-legedly caused by the systematic high-altitude release of chemical substances, re-sulting in the appearance of supposedly uncharacteristic criss-cross sky tracks.
He's a supporter of the chemtrail conspiracy theory that believes it's something to do with population control.
Each chemtrail conspiracist has their own version of beliefs, however, the premise for these theories go from 0-100, ranging from vapours that control the weather, to secret government environment poisoning operations, and even a way for them to control the population's minds.
In Stolen Skies: The Chemtrail Mystery, William Thomas writes:
Anthony served as a source of information and advocate on the airplane chemtrail conspiracy.
Meanwhile, the Internet was abuzz with chemtrail conspiracy theories ranging from aliens leaving messages in the sky to government agencies dumping mind-control chemicals on an unsuspecting populace.
I refer to the doubly misleadingly titled "Debunking the chemtrail conspiracy" by Dennis Mersereau which appeared in the Sunday Mail of 21 February.