U-boat /ūˈbōt or (German) ooˈ/

A German submarine

• actinism
• actinisms
• actinium
• actiniums
• actino-
• actinobacilli
• actinobacillosis
• actinobacillus
• actinoid
• actinoids
• actinolite
• actinolites
• actinometer
• actinometers
• actinomorphic
• actinomorphy
• Actinomyces
• actinomycoses
• actinomycosis
• actinon
• actinons
• actinotherapies
• actinotherapy
• Actinozoa
• actins