isotonic /ī-sō-tonˈik/

1. Having the same tone, tension or osmotic pressure
2. (of muscular contraction) shortening the muscle fibres and moving a joint
3. (of an energy drink) containing salts and minerals of the same concentration as in the body

• lightening
• lightenings
• lightens
• lighten up
• lighter
• lighterage
• lighterages
• lighterman
• lightermen
• lighters
• lighter-than-air
• lightest
• light-faced
• light-fast
• light-fingered
• light flyweight
• light-footed
• light-footed archaic light-foot
• lightful
• light-handed
• light-headed
• light-headedly
• light-headedness
• light-hearted
• light-heartedly