The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
sy-
DEFINITION:
Also s-. To bind, sew. Contracted from *s(y)u-. I. Basic form *sy-.sew, from Old English seowian,siowan, to sew, from Germanic *siwjan. II. Variant form *s-.1.seam, from Old English sam, seam, from Germanic *saumaz.2.suture; accouter, couture, from Latin suere (past participle stus), to sew. 3. Suffixed form *s-dhl-.subulate, from Latin sbula, awl (< sewing instrument). 4. Suffixed form *s-tro-.sutra; Kamasutra, from Sanskrit stram, thread, string. III. Suffixed shortened form *syu-men-.hymen, from Greek humn, thin skin, membrane. (Pokorny s- 915.)