ventral fin

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Related to ventral fins: pectoral fin

ventral fin

ventral fin
A vertical, stabilizing fin on the lower rear portion of a fuselage that helps increase directional stability, especially at higher Mach numbers, by increasing the area behind the vertical axis.
References in periodicals archive ?
Ventral fins are without any markings, almost completely transparent yellow with some pale white at the basis and white at the tip.
1973) have clusters of xanthophores in the finfolds of both the dorsal and ventral fins, and on the dorsal body, respectively.
Origin of first dorsal fin from 2 to 7 scales in front of tips of ventrals; origin of ventral fins 1 to 5 scales in front of tips of pectorals.