noun / verb
froth
FRAWTH/frɔːθ/
A light mass of bubbles on a liquid's surface.
A dense layer of froth floats on the amber liquid.

Etymology
Old Norse froða already meant froth, the bubbly substance named in English. It is one possible source; the word may instead come from an unrecorded Old English noun.
In context
they enclose a six-sided figure it's hexagonal as are most of the bubbles on the surface of this froth
More examples
- She skims the froth off the simmering broth.
- I froth warm milk with a small whisk.
- The soapy water froths as it pours into the sink.
Forms
froth · froths · frothed · frothing
frothy adjective — Covered with or full of small bubbles.