microfoam

From micro- +‎ foam.

• (UK) IPA^(key): /ˈmʌɪkɹə(ʊ)fəʊm/

microfoam (countable and uncountable, plural microfoams)

1. Foam consisting of very small bubbles, specifically as an element in the steamed milk used to make certain types of latte coffee.

   Coordinate term: macrofoam

   • 2009, Roseane Santos, An Unashamed Defence of Coffee, page 188:

     When a barista steams the milk for a cappuccino, microfoam is created by introducing very tiny bubbles of air into the milk, giving the milk a velvety texture and sweetness.