Sput·nik 
(sptnĭk, spŭt-, sptnyĭk)
(sptnĭk, spŭt-, sptnyĭk)n.
Any of a series of Soviet satellites sent into Earth orbit, especially the first, launched October 4, 1957.
[Russian sputnik (zemli), fellow traveler (of Earth) : so-, s-, together; see ksun in the Appendix of Indo-European roots + put', path, way; see pent- in the Appendix of Indo-European roots + -nik, n. suff.]
- cell-mediated immunity
- cell membrane
- cello
- cellobiose
- celloidin
- cellophane
- cellophane noodle
- cell phone
- cellphone
- cell plate
- cell sap
- cellular
- cellular automaton
- cellular immunity
- cellularity
- cellularly
- cellular respiration
- cellular slime mold
- cellular telephone
- cellulase
- cellule
- cellulite
- cellulitis
- celluloid
- cellulolytic