1. A hydrogen atom in an acid that forms a positive ion when the acid dissociates
   - acidic hydrogen

Type of: hydrogen atom

• unloose
• unloosen
• unlovable
• unloved
• unlovely
• unloving
• unlubricated
• unluckily
• unluckiness
• unlucky
• unmade
• unmake
• unmalicious
• unmalleability
• unmalleable
• unmalted
• unman
• unmanageable
• unmanageableness
• unmanageably
• unmanful
• unmanfully
• unmanlike
• unmanliness
• unmanly