airplane part, 1912, from French longeron, from longer "to skirt, extend along," from allonger "to lengthen" (see lunge (n.)).
Entries linking to longeron
lunge n.
1735, "a thrust with a sword," originally a fencing term, shortened from allonge, from French allonger "to extend, thrust," from Old French alongier "to lengthen, make long," from à "to" + Old French long, from Latin longus "long" (see long (adj.)).