Aerofoil (Author), from the Greek ἀέρος and φυλλον, lit. an air-leaf. Denoting the organ of sustentation of an aerodone or aerodrome, or the spread wings of a bird. A supporting member (or members collectively) of undefined form; thus pterygoid aerofoil, an aerofoil of wing-like form; plane aerofoil, an aeroplane, etc., §§ 112, 128, 172.
Aerodone (Author), from the Greek ἀερο-δόνητος, lit. tossed in mid air; soaring. To denote a gliding or soaring model or machine; in particular, any gliding or soaring appliance destitute of propelling apparatus or auxiliary parts; in contradistinction to aerodrome.
Aerodonetics (Author, see aerodone). The science specifically involved in problems connected with the stability or equilibrium of an aerodone or aerodrome, or of birds in flight, and with the phenomenon of soaring. Equivalent to Aerodromics, as proposed by Langley (p. vi. footnote 1).
Aerodrome (Langley), from the Greek ἀερο-δρόμος, lit. traversing the air; an air runner; originally proposed to denote a gliding or soaring model or machine, or a flying machine of any kind. Restricted by the author to the latter signification; a fully -developed flying appliance; a power-propelled aerodone, or an aerodone furnished with directive apparatus. Something more than single aerodone. (Preface, p. v., footnote.)