kihōkai
1. rare decay
Noun
1. rare decay
1. rare; seldom
1. Tehran (Iran)
1. collapse; crumbling
2. (radioactive) decay; disintegration
1. I pray; I wish
1. Not rare.; Not unusual.
1. Rarely; Unlikely
1. It's not common.; It's unusual.
1. Wasn't rare; Wasn't scarce
1. Was not rare.; Was not uncommon.