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daymark

American  
[dey-mahrk] / ˈdeɪˌmɑrk /

noun

  1. a navigational aid distinctively marked for visibility by day.

Etymology

Origin of daymark

day + mark 1

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.