1. Heavier-than-air craft that is propelled by the flapping of wings
   - ornithopter

Derived forms: orthopters

Type of: heavier-than-air craft

• Sir Tim Rice
• Sir Tom Stoppard
• Sir Walter Norman Haworth
• Sir Walter Ralegh
• Sir Walter Raleigh
• Sir Walter Scott
• Sir William Alexander Craigie
• Sir William Chambers
• Sir William Crookes
• Sir William Gerald Golding
• Sir William Gilbert
• Sir William Herschel
• Sir William Huggins
• Sir William Rowan Hamilton
• immoveable
• immune
• immune carrier
• immune gamma globulin
• immune globulin
• immune reaction
• immune response
• immune serum globulin
• immune suppressant drug
• immune system
• immunisation