Definition of "trimer" []

• A molecule formed by combining three identical smaller molecules. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Acetaldehyde forms a trimer in the presence of acid catalysts such as sulphuric or phosphoric acid, to make paraldehyde, a pharmacological sedative."
• "However, this group from Princeton actually make a trimer!"
• "There are two forms of acetone peroxide: A dimer and a trimer."