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

• perigee
• perigees
• perigeneses
• perigenesis
• periglacial
• perigon
• perigone
• perigones
• perigonia
• perigonial
• perigonium
• perigons
• Perigordian
• perigynies
• perigynous
• perigyny
• perihelia
• perihelion
• perihepatic
• perihepatitis
• perihepatitises
• perikarya
• perikaryon
• peril
• periled