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

Derived forms: isotheres

• Gregory XIII
• Gregory XVI
• greisen
• gremlin
• Grenada
• Grenada dollar
• grenade
• grenade thrower
• Grenadian
• grenadier
• grenadine
• Grenoble
• gres-gris
• Gresham
• Gresham's Law
• Greta Garbo
• Greta Louisa Gustafsson
• Gretzky
• grevillea
• Grevillea banksii
• Grevillea robusta
• Grevillea striata
• Grevillela parallela
• grevy's zebra
• Grewia