Scor·pi·us 
(skôrpē-əs)
(skôrpē-əs)n.
A constellation in the Southern Hemisphere near Libra and Sagittarius, containing the bright red star Antares. Also called Scorpio, Scorpion.
[Latin scorpius, scorpion, Scorpius; see SCORPION.]
- on-screen
- onset
- onshore
- onside
- onside kick
- on sight
- onsite
- onslaught
- on soapbox
- on (someone's) account
- on someone's account
- on (someone's) back
- on someone's back
- on (someone's) case
- on someone's case
- on speaking terms
- on spec
- onstage
- on standby
- on steroids
- onstream
- on-stream
- on stream
- on strike
- -ont