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Glite Dictionary
🐟 A fish's lower fin 🚀 A lower stabilizer
ventral fin

ventral fin

6.1
A fin under a fish that helps it balance and turn
  • noun
  • /ˈvɛntrəl fɪn/
  • Specialized
translation icon : aleta ventral
  • The fish uses its ventral fin to steer.

Examples

  • The ventral fin helps the fish stabilize itself as it swims through the water.

  • If a fish injures its ventral fin, it may have trouble keeping its balance.

  • In some species, the ventral fins are larger and play a role in mating displays.

  • Sharks have a pair of ventral fins that help with balance.

  • The ventral fin of the fish helps it steer smoothly through the water.

  • When observing aquatic animals, note how the ventral fin affects their movement.

  • The shark uses its ventral fins to stabilize itself while swimming swiftly.

Synonyms

fin
vsventral fin
45 1.0

A flat part on a fish's body that helps it swim and stay balanced

is a specific underside pair used mainly for directional control rather than general swimming
pelvic fin
vsventral fin
  • Specialized
6.3

One of a pair of small fins on the lower body of a fish that help it steer

is the underside pair specifically at the rear that helps control direction

Surface Forms

ventral fin singular
ventral fins plural

Morphology

ventral + fin

If a learner knows 'ventral' (pertaining to the front or lower part) and 'fin' (a projecting element), the meaning 'a fin mounted on the underside' is directly and transparently derived from combining the two. Although the term is technical (aeronautics/biology), its compositional structure is regular and cross-linguistically common, so a B1 learner who knows both constituents should be able to understand it.

Etymology

Ventral fin is a fin on a fish's belly; ventral means belly and fin is the flat limb the fish uses to move. Imagine small fins under the body acting like tiny legs that keep the fish steady and help it turn, so the term refers to a fin that aids 'balance' and 'steering'.