Dictionary.com
Thesaurus.com

Irish Sea

American  

noun

  1. a part of the Atlantic Ocean between Ireland and England.

Irish Sea British  

noun

  1. an arm of the North Atlantic Ocean between Great Britain and Ireland

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Small margins - but can Wales now build on an improved display across the Irish Sea?

From BBC • Feb. 23, 2026

The beach is a good place to watch ships sailing out from the mouth of the Mersey estuary into the Irish Sea.

From BBC • Feb. 13, 2026

But McShane says the number of bands who can afford to cross the Irish Sea is slowly shrinking.

From BBC • Jan. 20, 2026

Stretching east to west from the North Sea to the Irish Sea, Hadrian's Wall featured a series of forts and towers placed at regular intervals.

From Science Daily • Dec. 21, 2025

He says the Irish Sea was rough and when he leaned over the side his teeth dropped out.

From "Angela's Ashes: A Memoir" by Frank McCourt

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.