1. Occurring singly; not one of a pair
   "the azygous muscle of the uvula"
   - azygos

See also: single

• facial recognition
• facial tissue
• facial vein
• facially
• facies
• facile
• facilitate
• facilitation
• facilitative
• facilitator
• facilitatory
• facility
• facing
• facing pages
• facsimile
• facsimile machine
• fact
• fact mood
• fact of life
• fact-finding
• facticity
• faction
• factional
• factionalism
• factious