Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “seal”

See all translations

seal

noun [C]  /sil/ us  

seal noun [C] (ANIMAL)

a large, fish-eating mammal that has very thick fur and lives in the sea: Seals are sometimes hunted for their valuable fur.

seal noun [C] (OFFICIAL MARK)

an official mark on a document which shows that it is legal or actually what it claims to be: Diplomas are stamped with the state seal. A seal of approval means that something has been proven to be good or is very pleasing: My brother’s girlfriend got my mom’s seal of approval.

seal noun [C] (COVERING)

anything that prevents the escape of liquid or gas from a container or pipe: The oil seal broke, and all the oil leaked from the engine. Don’t use that jar of baby food if the seal is broken.

seal

verb [T]  /sil/ us  

seal verb [T] (CLOSE)

to close a container or opening, or to prevent the escape of a liquid or gas from something: Rubber seals jars tightly. He sealed the envelope and put a stamp on it. [M] Broiling with high heat seals in the flavor of the meat. [M] The police sealed off the area (= prevented people from entering it). If official documents are sealed, they cannot be seen or are not available to the public.

seal verb [T] (APPROVE)

to formally approve an agreement: They sealed the agreement with their signatures.
(Definition of seal from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of seal?
Add Cambridge dictionaries to your browser to your website

Definitions of “seal” in other dictionaries

Word of the Day

punt

a long, narrow boat with a flat bottom and a square area at each end, moved by a person standing on one of the square areas and pushing a long pole against the bottom of the river

Word of the Day

Byronic, Orwellian and Darwinian: adjectives from names.

by Liz Walter,
April 15, 2015
Becoming an adjective is a strange kind of memorial, but it is often a sign of a person having had real influence on the world. Science is full of examples, from Hippocrates, the Greek medic born around 460 BC, who gave his name to the Hippocratic Oath still used by doctors today,

Read More 

dumbwalking noun

April 20, 2015
walking slowly, without paying attention to the world around you because you are consulting a smartphone He told me dumbwalking probably wouldn’t be a long-term problem.

Read More