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Definition of coastline

coastline

/ˈkoʊst.laɪn/
coast · line
Plural:coastlines
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coastline Lexical Profile

coastline Game Scores & Validity

• noun

1

The outline, boundary, or shape of a coast, especially as viewed from the sea, the air, or on a map; the area where land meets the sea or ocean.

Example

"The rugged coastline of Maine is dotted with historic lighthouses and sheltered fishing harbors."

Synonyms
View all synonyms for coastline
Antonyms
View all antonyms for coastline

• Nearby Words

coastguard
coastguardsman
coastland
coastline
coastwards
coat
coatdress

Word Origin & Etymology

Formed in the 19th century as a compound of 'coast' (from Old French 'coste', ultimately from Latin 'costa', meaning 'rib' or 'side') and 'line' (from Old English 'line' and Old French 'ligne').

Cite this Entry

Wordmom. (2026). Definition of Coastline. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/coastline
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