1. A radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
   - neptunium, Np

Type of: metal, metallic element

• Penstemon deustus
• Penstemon dolius
• Penstemon fruticosus
• Penstemon linarioides
• Penstemon newberryi
• Penstemon palmeri
• Penstemon parryi
• Penstemon rupicola
• Penstemon rydbergii
• Penstemon serrulatus
• Penstemon whippleanus
• penstock
• pent
• pent-up
• penta-
• pentacle
• pentad
• pentaerythritol
• pentagon
• Pentagon Gang
• pentagonal
• pentagram
• pentahedral
• pentahedron
• mud plantain