Yeast

/jiːst/

Meaning & Definition

noun
A type of fungus that is used in baking and brewing to ferment sugars, producing carbon dioxide and alcohol.
I added yeast to the dough to help it rise.
A single-celled fungus belonging to the group of fungi that reproduce by budding.
Yeast can be found in many environments, including the surface of fruits.
A person or thing that brings about a change or encourages development.
She was the yeast of creativity in the group, inspiring everyone with her ideas.

Etymology

Middle English 'yeast', from Old English 'gist', related to German 'Gäst', meaning 'to ferment'.

Common Phrases and Expressions

on yeast:
Referring to being in a state of growth or potential.
baker's yeast:
A form of yeast specifically used in baking.
yeast infection:
A fungal infection caused by an overgrowth of yeast.

Related Words

Slang Meanings

When something is lively or energetic.
That party was really yeast!
A term for someone who's acting silly or hyper.
He's being such a yeast right now.