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1. 1.1 An unpaired fin on the underside of certain fishes.
   （某些鱼类下腹的）腹鳍
   Example sentencesExamples

   • Haddock are typically cod-like with three dorsal fins and two ventral fins.
   • In green swordtails, the sword consists of a set of ventral fin rays that extend posteriorly beyond the caudal fin margin.
   • They have no pectoral or ventral fins and their dorsal, tail and anal fins are merged into one long fin down the back.
   • The Feather Fin with its curtain-like ventral fin and carbon black body swirls its ventral fin even while remaining stable in the water.
   • Cod have three dorsal fins and two ventral fins for increased manoeuvrability.
2. 1.2 A single vertical fin under the fuselage or tail of an aircraft.
   （飞机机身或机尾下的）垂直翼
   Example sentencesExamples

   • A ventral fin was also installed but by the time testing was completed, the Navy had lost interest in the program.
   • The Star also sported a forward-opening canopy, ventral fin and composite MT prop.
   • IAI and Cyclone Aviation Products Ltd in Carmiel manufacture the ventral fins, rudders, horizontal stabilisers and engine access doors.
   • The Impala has a small lipstick camera mounted on the ventral fin to record the visual and audio aspects of your flight.