1. Having three sides
   - trilateral, triangular

See also: many-sided, multilateral

• over-the-hill
• over-the-shoulder bombing
• over-the-top
• overabundance
• overabundant
• overachieve
• overachievement
• overachiever
• overact
• overacting
• overactive
• overactivity
• overage
• overaged
• overall
• overambitious
• overanxiety
• overanxious
• overappraisal
• overarch
• overarm
• overawe
• overawed
• overbalance
• overbear