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

Derived forms: ornithopters

Type of: heavier-than-air craft

Encyclopedia: Ornithopter

• secondary coil
• secondary dentition
• secondary diagonal
• secondary dysmenorrhea
• secondary education
• secondary emission
• secondary hypertension
• secondary industry
• secondary modern
• secondary modern school
• secondary school
• secondary sex character
• secondary sex characteristic
• secondary sexual characteristic
• secondary storage
• secondary syphilis
• secondary winding
• seconder
• secondhand
• secondhand car
• secondly
• secondment
• secondo
• seconds hand
• Secotiaceae