swim cap

or swimming cap

A snug elastic cap worn in the water especially to increase speed in competitive swimming or to keep the hair dry. Also called bathing cap.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Mentioned in

bathing cap
cap
capped
swimming
swimming cap

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