ὕσπληξ

Etymology
Traditionally analysed as a compound of and. In view of the variants with pre-nasalization, however, a origin seems the most likely option.

Noun

 * 1) snare or gin of a birdcatcher
 * 2) part of a spring or noose which slips down when touched
 * 3) twisted strand
 * 4) contrivance for starting a race