Meaning of “seal” - Learner’s Dictionary

seal

noun [ C ] uk us /siːl/
ANIMAL

B2 an animal with smooth fur that eats fish and lives near the sea

ON A CONTAINER

a piece of paper or plastic on a container that you break in order to open it

OFFICIAL MARK

an official mark made of wax, paper, or metal that is put on important documents

STOP LIQUID/AIR

(Definition of “seal noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)