rig·a·to·ni 
(rĭg′ə-tōnē)
(rĭg′ə-tōnē)n.
Pasta in ribbed, slightly curved, large-sized tubes.
[Italian, from rigato, past participle of rigare, to draw a line, from riga, line, of Germanic origin.]
- opossum
- opossum shrimp
- Oppenheimer
- opponency
- opponent
- opportune
- opportunely
- opportuneness
- opportunism
- opportunist
- opportunistic
- opportunistic infection
- opportunity
- opposability
- opposable
- oppose
- opposer
- opposite
- opposite field
- opposite-field
- oppositely
- oppositeness
- opposite number
- opposition
- oppositional