1A flattened appendage on various parts of the body of many aquatic vertebrates and some invertebrates, including fish and cetaceans, used for propelling, steering, and balancing.
- He then uses this to explain why there are no post-anal fins in fish: the tail is itself an appendage.
- Powerful fins propel the streamlined fish toward meals of smaller fish and squid - and away from hungry sharks.
- In essence, only the paired fins and the tail fin remain.
1.1An underwater swimmer’s flipper.
- Training equipment such as kickboards, pull buoys, and fins help all swimmers to isolate or emphasize certain movements.
- The next steps involve the whole stroke, removing the fins, underwater kicking to stroke start and finally the block start.
- You take a look around the pool and are surprised to see that a number of swimmers are using fins, especially on kick sets.
1.2A small flattened projecting surface or attachment on an aircraft, rocket, or automobile, providing aerodynamic stability or serving as a design element.
- The center fin was a fixed surface, extending vertically above the stabilizer at the center line of the airplane.
- Simply described, the fins improve directional stability by channeling and smoothing the airflow around the tailcone.
- Aerodynamic fins located on the aft bay of the strap-ons also provided for flight control.
1.3A flattened projection on a device, such as a radiator, used for increasing heat transfer.
- The fins conduct heat from the tubes and then transfer it to the air flowing through the radiator.
- Concrete structural fins act as shading devices on the north-south axis.
- The top and bottom of the Cool Drive have fins for heat dissipation.
verb (fins, finning, finned)[no object]
Swim underwater by means of flippers: I finned madly for the surface
More example sentences
- They then did some shallow water running followed by duck diving and finning (swimming with flippers).
- I finned along the starboard side to the base of the bow, where I found a monster edible crab.
- We finned back along the port side and, after a bottom time of 15 minutes, our slow ascent up the shotline commenced.
- Example sentences
- Researchers in inspection stations will closely watch the white-flag dolphins and finless porpoises.
- These butchered, finless, and fully conscious creatures, sink to the bottom.
- Below the iconic duo a trio of very sorry looking, finless, sharks are shown floundering.
- [in combination]: primitive ray-finned fishes
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