Etymology
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Words related to seam

*syu- 
syū-, also sū:-, Proto-Indo-European root meaning "to bind, sew."

It forms all or part of: accouter; couture; hymen; Kama Sutra; seam; sew; souter; souvlaki; sutra; sutile; suture.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit sivyati "sews," sutram "thread, string;" Greek hymen "thin skin, membrane," hymnos "song;" Latin suere "to sew, sew together;" Old Church Slavonic šijo "to sew," šivu "seam;" Lettish siuviu, siuti "to sew," siuvikis "tailor;" Russian švec "tailor;" Old English siwian "to stitch, sew, mend, patch, knit together."
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seamless (adj.)

c. 1400, semeles, of a garment, "woven without a seam," from seam (n.) + -less. The figurative sense of "whole, integrated" is attested by 1862. Seamless transition is attested by 1975. Seam-free (1946) was a hosiery advertiser's word. Related: Seamlessly; seamlessness.

seamstress (n.)

"needlewoman, woman who sews or makes seams," 1640s, with -ess + seamster (also sempster) from Middle English semester "one who sews, one whose occupation is sewing," from Old English seamestre "sewer, tailor, person whose work is sewing," from seam (n.) + -ster.

The -ster ending is feminine, but in Old English seamestre also was applied to men, and the Middle English word was used of both sexes, though seamsters were "usually female" [Middle English Compendium]. Evidently by 17c. the fem. ending no longer was felt as such and a new one added (as in children, etc.), and seamster thence was applied to male sewers.

seamy (adj.)

c. 1600, "least pleasant, worst," literally "having a seam or seams," but here especially "showing the seams," in the figurative phrase seamy side, from seam (n.) + -y (2). The seamy side of a sewn garment is less attractive and is typically turned in. The popularity of the figurative sense likely is due to its use by Shakespeare: "turn'd your wits the seamy-side without" ["Othello" IV.ii.146]