1. Quality or degree of being harmless, esp. to health
   - innocuousness, nontoxicity

Derived forms: harmlessnesses

• sour bread
• sour cherry
• sour cherry tree
• sour cream
• sour dock
• sour fig
• sour gourd
• sour grapes
• sour grass
• sour gum
• sour mash
• sour mash whiskey
• sour milk
• sour orange
• sour salt
• sour-gum family
• sour-tasting
• sourball
• source
• source book
• source code
• source language
• source materials
• source of illumination
• source program