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Agonic, ag′on-ik, adj. having or making no angle.—Agonic line, the line of no magnetic variation—an irregular line passing through the magnetic poles of the earth, along which the magnetic needle points directly north or south.

These two observations, one by Columbus and the other by Cabot, sufficed to determine the position of the agonic line, or line of no variation, for that locality and epoch.

For Spanish Philosopher Miguel de Unamuno, who died in 1936 at the age of 72, life's true meaning lay in what he called "agonic struggle."

Agonic line, line along which the needle points due north and south.