Cite
 

Meaning of crossjack

cross•jack

Pronunciation: (krôs'jak", kros'-Naut.krô'jik, kroj'ik), [key]
— n. Naut.
  1. the lowermost square sail set on the mizzenmast of a ship or of a bark with four or more masts; mizzen course. See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: