froth

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froth

(frôth, frŏth)
n.
1. A mass of bubbles in or on a liquid; foam.
2. Salivary foam released as a result of disease or exhaustion.
v. (also frôth, frŏth) frothed, frothing, froths
v.tr.
1. To cover with foam.
2. To cause to foam.
v.intr.
To exude or expel foam: a dog frothing at the mouth.