clot

1 of 2

noun

ˈklät 

1

: a portion of a substance adhering together in a thick nondescript mass (as of clay or gum)

2

a

: a roundish viscous lump formed by coagulation of a portion of liquid or by melting

b

: a coagulated mass produced by clotting of blood

3

British : blockhead

4

: cluster, group

a clot of spectators

clot

2 of 2

verb

clotted; clotting

intransitive verb

1

: to become a clot : form clots

2

: to undergo a sequence of complex chemical and physical reactions that results in conversion of fluid blood into a coagulated mass : coagulate

transitive verb

1

: to cause to form into or as if into a clot

2

: to fill with clots

also : clog

clotted streets

Synonyms of clot

Noun

• cluster
• batch
• collection
• array
• clump
• bunch
• constellation
• group
• lot
• assemblage
• grouping
• battery

Verb

• block
• obstruct
• jam
• occlude
• clog

Examples of clot in a Sentence

Noun

We were told that his stroke was caused by a clot in his brain.

a clot of daisies occupied one corner of the flower bed

Verb

medications that prevent blood from clotting

substances that help to clot blood

Recent Examples on the Web

Noun

It is treated with beta blockers and blood-thinning medicine to reduce risks of clots and other flareups. —Kelly McGreal, FOXNews.com, 22 Apr. 2026

Bleeding through a tampon or pad in less than 1 hour, passing large clots, or requiring blood transfusions should prompt discussion with your gynecologist or primary care physician, ACOG advises. —Dr. Chidimma J. Acholonu, ABC News, 3 Apr. 2026

Verb

Rat poison typically includes bromadiolone, which prevents blood from clotting, according to the Austrian Agency for Health and Food Safety. —ABC News, 20 Apr. 2026

And on those higher ozone days, there were more hemorrhage (bleeding, as opposed to clotting) strokes and more plaque buildup causing major arteries to harden. —Theresa Gaffney, STAT, 4 Mar. 2026

Word History

Etymology

Noun

Middle English, from Old English clott; akin to Middle High German klōz lump, ball — more at clout

First Known Use

Noun

before the 12th century, in the meaning defined at sense 1

Verb

1530, in the meaning defined at intransitive sense 1

Phrases Containing clot

• blood clot
• clot-buster

Rhymes for clot

• aught
• baht
• blot
• bott
• bought
• brought
• caught
• cot
• cott
• dot
• fought
• fraught

Kids Definition

clot

1 of 2 noun

ˈklät 

: a mass or lump made by a liquid (as blood) that thickens and sticks together

clot

2 of 2 verb

clotted; clotting

: to become or cause to become a clot : form clots

Medical Definition

clot

1 of 2 noun

ˈklät 

: a coagulated mass produced by clotting of blood

clot

2 of 2 verb

clotted; clotting

intransitive verb

: to undergo a sequence of complex chemical and physical reactions that results in conversion of fluid blood into a coagulum and that involves shedding of blood, release of thromboplastin from blood platelets and injured tissues, inactivation of heparin by thromboplastin permitting calcium ions of the plasma to convert prothrombin to thrombin, interaction of thrombin with fibrinogen to form an insoluble fibrin network in which blood cells and plasma are trapped, and contraction of the network to squeeze out excess fluid : coagulate

transitive verb

: to cause to form into or as if into a clot