1. A line connecting points on the earth's surface having the same mean summer temperature

Derived forms: isotheres

• appointed
• appointee
• appointive
• appointment
• appointment book
• appointment calendar
• apportion
• apportionable
• apportioned
• apportioning
• apportionment
• apposable
• appose
• apposite
• appositely
• appositeness
• apposition
• appositional
• appositive
• appositively
• appraisal
• appraise
• appraisee
• appraisement
• appraiser