A sound that has the quality of one of the high vowels, as (ē) or (), and that functions as a consonant before or after vowels, as the initial sounds of yell and well and the final sounds of coy and cow. Also called glide.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.