---

• a  having two axes
  biaxial crystals

• In the struggle to produce the definitive helicopter type, the industry has spawned single-rotor helicopters, coaxial (two rotors on one shaft) helicopters, biaxial (two rotors .
• The Piasecki Transporter, a new 40-place biaxial helicopter, is undergoing tests at Philadelphia.

• biaxal
• biaxate