Paramecium /par-ə-mēˈsi-əm or -mēˈshi-əm/

1. A genus of tiny animals including the slipper animalcule, a slipper-shaped infusorian
2. (without cap; pl paramēˈcia) an animal of the genus

• backswordmen
• backswords
• back talk
• back time
• back-to-back
• back to basics
• back to earth
• back to front
• back to nature
• back-to-nature
• back to square one
• backtrack
• backtracked
• backtracking
• backtrackings
• backtracks
• back translation
• back translations
• back up
• back-up
• backup
• backup file
• backup files
• backup light
• backup lights