1. Serving to support or corroborate
   - collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, validating, validatory, verificatory, verifying

See also: substantiate, supportive

• omeprazole
• omer
• omerta
• omicron
• omigod
• omigosh
• ominous
• ominously
• omissible
• omission
• omissive
• omit
• Omiya
• ommastrephes
• ommatidium
• Ommiad
• omni-
• omnibus
• omnidirectional
• omnidirectional antenna
• omnidirectional radio range
• omnidirectional range
• omnifarious
• omnipotence
• omnipotent