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Meaning of quadrantal corrector

quadran'tal correc'tor

Pronunciation: [key]
— Naut. Naut.
  1. either of two soft-iron spheres attached to each side of a binnacle, intended to correct the compass deviation resulting from magnetism from ferrous metal in a ship. See diag. under.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.