1. As a matter of instinct
   "he instinctively grabbed the knife"
   - instinctually, responsively

See also: instinctive

• spirituous
• Spirochaeta
• Spirochaetaceae
• Spirochaetales
• spirochaete
• spirochete
• Spirodela
• Spirodela polyrrhiza
• spirogram
• spirograph
• spirogyra
• spirometer
• spirometry
• spironolactone
• spirt
• spirula
• Spirula peronii
• Spirulidae
• spirulina
• spiry
• spit
• spit and polish
• spit curl
• spit out
• spit up