autacoid /öˈtə-koid/ (medicine)

1. An internal secretion that excites or inhibits action in various tissues
2. A hormone or chalone

• rat-poisons
• ratproof
• rat race
• rat races
• rat-rhyme
• rat-rhymes
• rat run
• rat runs
• rats
• ratsbane
• ratsbanes
• rat snake
• rat snakes
• rat's-tail
• rat-tail
• rat-tailed
• rattan
• rattans
• rat-tat
• rat-tats
• ratted
• ratteen
• ratteens
• ratten
• rattened