What does the word froth mean?

Usage examples for froth

  1. Whip the whites of the eggs to a stiff froth. – Joe Tilden's Recipes for Epicures by Joe Tilden
  2. It may seem foolish to record such mere froth of conversation, but I want my reader to understand how a part, at least, of the family of Moldwarp Hall regarded me. – Wilfrid Cumbermede by George MacDonald