doublet

noun

dou·​blet ˈdə-blət 

1

: a man's close-fitting jacket worn in Europe especially during the Renaissance

2

: something consisting of two identical or similar parts: such as

a

: a lens consisting of two components

especially : a handheld magnifier consisting of two lenses in a metal cylinder

b

: a spectrum line having two close components

c

: a domino with the same number of spots on each end

3

: a set of two identical or similar things: such as

a

: two thrown dice with the same number of spots on the upper face

b

: one of nine pairs of microtubules found in cilia and flagella

4

: one of a pair

specifically : one of two or more words (such as guard and ward) in the same language derived by different routes of transmission from the same source

Illustration of doublet

• doublet 1

Examples of doublet in a Sentence

Recent Examples on the Web

Italian scientist Alessandro Volta studied eel physiology to inspire the first battery, and recent work shows eels use doublets, two rapid spikes, to force rapid prey muscle contractions before the knockout blast. —Kaif Shaikh, Interesting Engineering, 17 Oct. 2025

These doublets are separated by an energy, or a frequency, known as the Rabi frequency. —Thomas Linker, The Conversation, 15 Oct. 2025

As a backdrop, doublets of aventurine glass over mother-of-pearl telegraphed the impression of an enchanting event. —Lily Templeton, Footwear News, 5 May 2025

The gemstones come in pink doublet, red doublet, and mother of pearl. —Enjanae' Taylor, Southern Living, 23 Jan. 2024

Word History

Etymology

Middle English, from Anglo-French dublet, from duble

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for doublet

• abet
• asset
• baguette
• banquette
• barbette
• beget
• beset
• brevet
• briquette
• brunet
• brunette
• burette

Kids Definition

doublet

noun

dou·​blet ˈdəb-lət 

1

: a close-fitting jacket worn by men of western Europe chiefly in the 16th century

2

: one of two similar or identical things

Medical Definition

doublet

noun

dou·​blet ˈdəb-lət 

1

: something consisting of two identical or similar parts: as

a

: a lens consisting of two components

b

: a spectrum line having two close components

2

: a set of two identical or similar things

especially : one of nine pairs of microtubules found in cilia and flagella