The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
(s)n-
DEFINITION:
Also n-. To spin, sew. Contracted from earlier *(s)ne1-.1. Suffixed form *n-tl-.needle, from Old English ndl, needle, from Germanic *nthl.2. Suffixed form *sn-m. nemato-; axoneme, chromonema, protonema, synaptinemal comples, treponema, from Greek nma, thread. 3. Suffixed o-grade form *sn-t-.snood, from Old English snd, headband, from Germanic *snd. (Pokorny (s)n- 973.)