A lightweight motorized bicycle that can be pedaled as well as driven by a low-powered gasoline engine. (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.
Use "moped" in a sentence
"Note: For clarification, I use the word moped for any 50cc vehicle."
"CIV in The Syfy EciLa trailer The Man on the moped is the Rabbit, get it?"
"Today you wrote that the moped was a poor compromise of efficiency and power."