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

Derived forms: isotheres

• gas fitting
• gas fixture
• gas furnace
• gas gage
• gas gangrene
• gas gauge
• gas giant
• gas gun
• gas guzzler
• gas heat
• gas heater
• gas helmet
• gas holder
• gas jet
• gas lamp
• gas line
• gas main
• gas maser
• gas meter
• gas mileage
• gas oil
• gas oven
• gas pedal
• gas phlegmon
• gas plant