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

Derived forms: isotheres

• terry
• terry towel
• terrycloth
• Tersanctus
• terse
• tersely
• terseness
• tertian
• tertiary
• Tertiary period
• tertiary syphilis
• tertigravida
• tertium quid
• Tertry
• Tertullian
• Terylene
• terza rima
• terzetto
• TESL
• tesla
• Tesla coil
• TESOL
• tessella
• tessellate
• tessellated