Heavier-than-air
[hev-ee-er-th uh n-air] /ˈhɛv i ər ðənˈɛər/
adjective
1.
(of an aircraft) weighing more than the air that it displaces, hence having to obtain lift by aerodynamic means.
adjective
1.
having a density greater than that of air
2.
of or relating to an aircraft that does not depend on buoyancy for support but gains lift from aerodynamic forces
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[hev-ee-sahyd] /ˈhɛv iˌsaɪd/ noun 1. Oliver, 1850–1925, English physicist. /ˈhɛvɪˌsaɪd/ noun 1. Oliver. 1850–1925, English physicist. Independently of Kennelly, he predicted (1902) the existence of an ionized gaseous layer in the upper atmosphere (the Heaviside layer); he also contributed to telegraphy