unˈdertone noun

1. A subdued tone of voice, sound, colour, etc
2. A tone felt as if pervading, underlying, or perceptible through others, including (figurative) an emotional tone
3. A difference tone (qv under differ)
4. A low state of body

• cathetometer
• cathetometers
• cathetus
• cathetuses
• cathexes
• cathexis
• cathinone
• cathinones
• cathisma
• cathismas
• cathodal
• cathode
• cathode-ray oscillograph
• cathode-ray oscillographs
• cathode rays
• cathode-ray tube
• cathode-ray tubes
• cathodes
• cathodic
• cathodic protection
• cathodograph
• cathodographer
• cathodographers
• cathodographies
• cathodographs