2219 zume {dzoo'-may}
probably from 2204; TDNT - 2:902,302; n f
AV - leaven 13; 13
1) leaven
2) metaph. of inveterate mental and moral corruption, viewed in its
tendency to infect others
Leaven is applied to that which, though small in quantity, yet by its
influence thoroughly pervades a thing; either in a good sense as in
the parable Mat. 13:33; or in a bad sense, of a pernicious influence,
"a little leaven leaveneth the whole lump"