noun Aeronautics.
a main longitudinal brace or support on an airplane.

1910–15; < French: side-piece, equivalent to long(er) to run alongside, skirt (derivative of long long1) + -eron noun suffix

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World English Dictionary
longeron (ˈlɒndʒərən)
a main longitudinal structural member of an aircraft
[C20: from French: side support, ultimately from Latin longuslong1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Both unstiffened and frame- and longeron-stiffened configurations were considered.
The goal is to grow larger trees and hold them longeron the landscape.
For reports pertaining to the longeron or stringer structure on the nacelles or pylons.
Inspect longeron left and right sides, from attachment fittings to the next aft bulkhead, for any evidence of corrosion.
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