aperiodic /ā-pē-ri-odˈik/

1. Not periodic
2. Highly damped and coming to rest without oscillation (physics)

aperiodicity /-ə-disˈi-ti/ noun

• St Patrick's Days
• St Peter's fish
• St Peter's wort
• str
• str.
• STR
• strabism
• strabismal
• strabismic
• strabismical
• strabismometer
• strabismometers
• strabisms
• strabismus
• strabismuses
• strabometer
• strabometers
• strabotomies
• strabotomy
• stracchini
• stracchino
• strack
• strad
• straddle
• straddleback