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

Rescue work continued in Venezuela on June 27 days after a doublet of earthquakes struck, killing at least 1,400 people and injuring thousands. — Jeanine Santucci, USA Today, 27 June 2026

The fact that doublets exist is a reminder that people should be on guard that a big quake can be followed up by a subsequent quake. — Los Angeles Times, 26 June 2026

In a doublet, the first earthquake relieves stress on one fault while increasing it on a nearby fault. — Kenton Gewecke, ABC News, 25 June 2026

Tobin said scientists are still weighing whether Wednesday’s sequence was indeed a doublet, though the USGS described it as such. — Evan Bush, NBC news, 25 June 2026

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
• binet
• 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