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

Derived forms: isogonal lines

Type of: line

• faff
• Fafnir
• fag
• fag end
• fag hag
• fag out
• Fagaceae
• Fagales
• fagged
• faggot
• faggot stitch
• faggot up
• faggoting
• Fagin
• Fagopyrum
• Fagopyrum esculentum
• fagot
• fagot stitch
• fagoting
• Fagus
• Fagus americana
• Fagus grandifolia
• Fagus pendula
• Fagus purpurea
• Fagus sylvatica