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

• fawn-colored
• fawn-coloured
• fawner
• cystic vein
• cysticercus
• cystine
• cystitis
• cystocele
• cystoid macular edema
• cystolith
• cystoparalysis
• Cystophora
• Cystophora cristata
• cystoplegia
• Cystopteris
• Cystopteris bulbifera
• Cystopteris fragilis
• Cystopteris montana
• cystoscope
• cystoscopy
• Cytesis proliferus
• Cytherea
• cytidine
• Cytisus
• Cytisus albus