Definition of pennant–winged nightjar
: either of two African nightjars: a : a bird (Macrodipteryx longipennis) that has second primary in the male with a very long almost naked shaft and a broad racketlike web at the tip b : a bird (Semeiophorus vexillarius) that has the second to fifth primaries more or less lengthened and the ninth extremely so although the shaft is not bare for any portion of its length
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