Etymology
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saltire (n.)

also saltier, c. 1400, sautour, an ordinary that resembles a St. Andrew's Cross on a shield or flag, consisting of a bend dexter and a bend sinister crossing each other, from Old French sautoir, sautour, literally "stirrup," and directly from Medieval Latin saltarium, noun use of neuter of Latin saltatorius "pertaining to leaping," from salire "to leap" (see salient (adj.)). The connection between stirrups and the diagonal cross is said to be the two deltoid shapes that comprise the cross.

updated on December 04, 2021

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Definitions of saltire from WordNet

saltire (n.)
a cross resembling the letter x, with diagonal bars of equal length;
Synonyms: St. Andrew's cross
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.