Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “arm”

arm

noun [C] (OF LAND/WATER)    /ɑːm/ US  /ɑːrm/
An arm of land or water is a long, thin part of it that is joined to a larger area.Bays and gulfsCoasts and beachesPromontories and peninsulas
(Definition of arm noun (OF LAND/WATER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of arm

Browse related topics

You are looking at an entry to do with Bays & gulfs, but you might be interested in these topics from the Seas, rivers & water topic area:

Definitions of “arm” in other dictionaries

Word of the Day

well in (with)

to have a good relationship with someone in which they like you and from which you get an advantage

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More