1. An imaginary line connecting points on the Earth's surface where the magnetic declination is the same
   - isogonic line, isogonal line

Derived forms: isogones

Type of: line

• tortilla
• tortilla chip
• tortillon
• tortious
• tortoise
• tortoise plant
• tortoiseshell
• tortoiseshell butterfly
• tortoiseshell turtle
• tortoiseshell-cat
• tortricid
• tortricid moth
• Tortricidae
• tortrix
• tortuosity
• tortuous
• tortuously
• tortuousness
• torture
• torture chamber
• tortured
• torturer
• torturesome
• torturing
• torturous