cog wheel (noun) ratchet wheel: wheel with teeth
Sinonime: ablution, absolution, atonement, baptism, bathing, catharsis, depuration, disinfection, distillation, expiation, expurgation, forgiveness, grace, lavation, laving, purgation, purge, purifying, rarefaction, rebirth, redemption, refinement, regeneration, salvation, sanctification, washing