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leaven

noun

1 leaven

A substance used to produce fermentation in dough or a liquid.

synonym: leavening.

Roget 663: bane, curse; evil etc. 619; hurtfulness etc. (badness) 649; painfulness etc. (cause of pain) 830; scourge ... show more

Roget 659: deterioration, debasement; wane, ebb; recession etc. 287; retrogradation etc. 283; decrease etc. 36.    ... show more

Roget 653: uncleanness etc. adj.; impurity; immundity, immundicity; impurity etc. 961 [of mind]. defilement, contamination etc. v.; ... show more

Roget 320: levity; lightness etc. adj.; imponderability, buoyancy, volatility.    feather, dust, mote, down, thistle, down, flue, ... show more

Roget 153: cause, origin, source, principle, element; occasioner, prime mover, primum mobile [Lat.]; vera causa [Lat.]; author etc. (producer) 164; mainspring; ... show more

Roget 56: component; component part, integral part, integrant part; element, constituent, ingredient, leaven; part and parcel; contents; appurtenance; feature; member etc. ... show more

Dutch: gistmiddel, rijsmiddel



2 leaven

An influence that works subtly to lighten or modify something:
— His sermons benefited from a leavening of humor.

synonym: leavening.

verb

1 leaven

Cause to puff up with a leaven:
— Unleavened bread.

synonyms: prove, raise.

Roget 469: qualify, limit, modify, leaven, give a color to, introduce new conditions, narrow, temper.    waffle, quibble, hem and haw (be uncertain) 475; equivocate ... show more

Roget 320: be light etc. adj.; float, rise, swim, be buoyed up.    render light etc. adj.; lighten, leaven.   

Roget 653: be unclean, become unclean etc. adj.; rot, putrefy, ferment, fester, rankle, reek; stink etc. 401; mold, ... show more


adjective

Roget 659: unimproved etc. (improve) etc. 658; deteriorated etc. v.; altered, altered for the worse; injured etc. v.; ... show more

Moby thesaurus: abate, adjust to, agent, alter, alterant, alterative, alterer, assuage, bespread, besprinkle, box in, breathe, brew, catalyst, catalytic agent, circumscribe, color, condition, crawl with, creep with ... show more.

Find more on leaven elsewhere: etymology - rhymes - Wikipedia.

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