English
tailplane
From tail + plane.
Proto-Indo-European *deḱ- ‘to tear, fray, shred’
…
Proto-Germanic *taglą ‘hair, fiber’
Proto-West Germanic *tagl
Old English tæġel
Middle English tail
English tail
Proto-Indo-European *pleh₂- ‘flat’
Proto-Indo-European *pl̥h₂nós
Proto-Italic *plānos
Latin plānus ‘plain’
Latin plānum ‘flat surface’
English plane
Today it means
noun A horizontal airfoil, at the rear of an aircraft, to which the elevator is attached; usually associated with the tailfin.
Language periods are conventional ranges, not dates for this word.
Etymograph / tailplane