1. (chemistry) the theory that all indicators are either weak acids or weak bases in which the colour of the ionized form is different from the colour before dissociation
   - Ostwald's theory of indicators

Type of: scientific theory

• brown ale
• brown algae
• brown ash
• brown bat
• brown bear
• brown bells
• brown bent
• brown Betty
• brown bread
• brown bullhead
• brown butter
• brown coal
• brown creeper
• brown cup
• brown dwarf
• brown goods
• brown hickory
• brown hyena
• brown lacewing
• brown lemming
• brown oak
• brown onion sauce
• brown pine
• brown rat
• brown rice