Sentence:  An <WSD>aerodrome</WSD>, chiefly of steel, weighing, apart from fuel and water, about twenty-four pounds, was launched on the Potomac River on May 6, 1896, and flew for over half a mile. 
Meaning of the word marked with <WSD> tags:  A flying machine composed of aeroplanes. An aeroplane, particularly one constructed by or according to the design of Samuel Pierpont Langley and Charles M. Manly.<ref>'''1906''' Frederick Lanchester, "Flight - Volume 1 - Aerodynamics", page "v" (footnote): "A word derived from the Greek, (άερο-δρὀμος) (lit. "traversing the air" or "an air-runner"), proposed by the late Prof. Langley to denote a gliding appliance or flying machine; hence also aerodromics, the science specifically involved in the problems connected with "free flight"."</ref><ref>'''1911''', "Aeronautics", "Encyclopædia Britannica" — The term "aeroplane" is understood to apply to flat sustaining surfaces, but experiment indicates that arched surfaces are more efficient. S. P. Langley proposed the word "aerodrome", which seems the preferable term for apparatus with wing-line surfaces.</ref>