yoc·to·sec·ond 
(yŏktə-sĕk′ənd)
(yŏktə-sĕk′ənd)n. Abbr. ys or ysec
One septillionth (10-24) of a second.
- standing stone
- standing wave
- Standish
- stand off
- standoff
- standoffish
- standoffishness
- stand on
- stand (one's) ground
- stand one's ground
- stand on head
- stand on (one's) head
- stand on one's head
- stand on one's own feet
- stand on (one's) own/two feet
- stand on one's two feet
- stand on own feet
- stand on two feet
- stand out
- standout
- stand over
- stand pat
- standpat
- standpatter
- standpipe