1. Plutonium 239 that is recovered when nuclear weapons are disassembled; it is stored in plutonium pits
   - weapons plutonium

Type of: plutonium 239

• excitedly
• ironworks
• irony
• Iroquoian
• Iroquoian language
• Iroquois
• Iroquois League
• irradiate
• irradiation
• irrational
• irrational hostility
• irrational impulse
• irrational motive
• irrational number
• irrationality
• irrationally
• Irrawaddy
• Irrawaddy River
• irreality
• irreclaimable
• irreconcilability
• irreconcilable
• irreconcilableness
• irreconcilably
• irrecoverable