wind tunnel — a tubular chamber or structure in which a steady current of air can be maintained at a controlled velocity, equipped with devices for measuring and recording forces and moments on scale models of complete aircraft or of their parts or, sometimes, on full-scale aircraft or their parts.
Four-or-more syllable rhymes
channel tunnel — the Anglo-French railway tunnel that runs beneath the English Channel, between Folkestone and Coquelles, near Calais; opened in 1994
