vertical fin
1
4.3
- noun
- /ˈvɜrtɪkəl fɪn/
- Specialized
- The engineer explained how the vertical fin on the tail helped maintain the aircraft's directional control.
Examples
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During the inspection, they decided to check the vertical fin for any signs of damage that could affect performance.
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The turbulence causes an undetected crack in the vertical fin to propagate, and the fin snaps off.
Blog text (5) -
Reports vary, but most witnesses saw the first flames either at the top of the hull just forward of the vertical fin (near the ventilation shaft between cells 4 and 5) or between the rear port engine and the port fin (in the area of gas cells 4 and 5, where Ward and Antrim had seen the fluttering).
Blog text (12) -
The airplane was designed with a robust vertical fin to enhance its stability during flight.
Synonyms
1
5.9
Upright part of an airplane tail that helps keep the plane pointing straight during flight
1
4.2
A vertical surface at the plane's tail that helps keep it steady in flight
1
5.4
A vertical fin at the back of an airplane that keeps it flying straight
1
6.0
The upright fin on a plane's tail that keeps it pointed straight
Surface Forms
Morphology
The meaning is directly compositional: 'vertical' (upright/perpendicular) combined with 'fin' (a projecting surface) yields a fin oriented vertically, and its role as a stabilizing surface for directional control is a predictable technical extension. This straightforward combination follows normal noun–adjective composition and is cross-linguistically transparent, so a B1 learner who knows both constituents would readily infer the general meaning.
Etymology
The compound noun vertical fin comes from comparing the tail part to a fish fin that stands vertical, or up and down. Like an upright fin or rudder at the back, it keeps the plane from turning and helps it 'stay on course'.