heavier-than-air
Weighing more than the volume of air which it displacesWeighing more than the volume of air which it displaces.
Meaning
2 senses(comparative only)Weighing more than the volume of air which it displaces.
relating to an aircraft heavier than the air it displaces
(comparative only)Of, pertaining to, or using an aircraft which weighs more than the volume of air it displaces.