A metrical foot composed of two short syllables followed by one long one, as in the word seventeen.
A line of verse using this meter; for example, "'Twas the night before Christmas, when all through the house” ( Clement Clarke Moore).
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.