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

• definitive
• definitive host
• definitively
• definitiveness
• definitude
• deflagrable
• deflagrate
• deflagration
• deflate
• deflated
• deflation
• deflationary
• deflationary spiral
• deflator
• deflect
• deflection
• deflective
• deflector
• deflexed
• deflexion
• defloration
• deflower
• Defoe
• defog
• defogger