indumentum /in-dū-menˈtəm/ (biology)

1. A total covering of hair, feathers, etc
2. The underside of rhododendron leaves

• undershrubs
• underside
• undersides
• undersign
• undersigned
• undersigning
• undersigns
• undersized
• underskies
• underskinker
• underskinkers
• underskirt
• underskirts
• undersky
• undersleeve
• undersleeves
• underslung
• undersoil
• undersoils
• undersold
• under someone's wing
• undersong
• undersongs
• underspend
• underspending