1. (anatomy and zoology) an opening; a passage

Derived forms: ostia

Encyclopedia: Ostium

• forlorn hope
• forlornly
• forlornness
• form
• form bubbles
• form class
• form division
• form family
• form genus
• form genus Rhizoctinia
• form letter
• form of address
• form of government
• form-only
• formal
• formal garden
• formal logic
• formal semantics
• formaldehyde
• formalin
• formalisation
• formalise
• formalised
• formalism
• formalist