Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “diaphragm”


noun [C] (BIRTH CONTROL)    /ˈdaɪ.ə.fræm/
a circular rubber device that a woman puts inside her vagina before having sex, to avoid becoming pregnantContraception
(Definition of diaphragm noun (BIRTH CONTROL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of diaphragm

Definitions of “diaphragm” in other dictionaries

Word of the Day


the skill with which something was made or done

Word of the Day


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