Etymology
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deltoid (adj.)

"triangular, resembling the Greek letter delta," 1741, in deltoid muscle, the large muscle of the shoulder, which is so called for its shape, from Greek deltoeides "triangular," literally "shaped like the letter delta;" see delta + -oid. As a noun, "deltoid muscle," by 1758 (delts, short for "deltoid muscles," is by 1977). Related: Deltoidal.

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delt (n.)

"deltoid muscle," short for deltoid (q.v.). Related: Delts.

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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.

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