different between groupoid vs subgroupoid

English

group +? -oid

groupoid (plural groupoids)

(algebra) A magma: a set with a total binary operation.
(algebra and category theory) A set with a partial binary operation that is associative and has inverses and identities.
A groupoid is a category in which every morphism has an inverse.

sub- +? groupoid

subgroupoid (plural subgroupoids)

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