1. The cardinal number equal to 7 + 1.
2. The eighth in a set or sequence.
3. Something having eight parts, units, or members, especially:
a. Sports An eight-oared racing shell.
b. An eight-cylinder engine or motor vehicle.
[Middle English eighte, from Old English eahta; see oktō(u) in the Appendix of Indo-European roots.]
eight adj. & pron.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.