ring system
noun
1 Astronomy one around a planet.
2 Chemistry one in an organic molecule.
Origin
Mid 19th century.
- tweezer
- tweezers
- twelfth
- Twelfth Day
- twelfthly
- twelfth man
- Twelfth Night
- twelve
- twelve-bar
- twelve-bore
- twelvefold
- twelve-gauge
- twelve-incher
- twelve-inch single
- twelvemo
- twelvemonth
- twelve-note
- twelve-step
- twelve-stepper
- Twelve Tables
- twelve-tone
- Twelve Tribes of Israel
- twentieth
- Twentieth Century Fox
- twenty