1. Invariant with respect to direction
   - isotropic

See also: identical, isotropy

• flywheel
• Fm
• fMRI
• FNMA
• FO
• fo'c'sle
• foal
• foam
• foam at the mouth
• foam rubber
• foamflower
• foaminess
• foaming
• foamy
• fob
• fob off
• fob watch
• focaccia
• focal
• focal distance
• focal epilepsy
• focal infection
• focal length
• focal point
• focal ratio