Webster's English Dictionary

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froth

1. froth \'fro.th\ \'fro.ths, 'fro.thz\ n or froths [ME, fr. ON frotha; 
   akin to OE a-fre-othan to froth] pl  1a: bubbles formed in or on a liquid : 
   FOAM  1b: a foamy slaver sometimes accompanying disease or exhaustion  2: 
   something unsubstantial or of little value 
2. froth \'fro.th, 'fro.th\ vt 1: to cause to foam  2: VENT, VOICE  3: to 
   cover with froth  : to throw froth out or up : FOAM