free-swimming
- s (of animals) able to swim about; not attached
- He found that whale blood teems with tiny free-swimming organisms, 20 millions of them per cubic millimetre, with the propertyfamiliar in several forms of bacteriaof .
- His bathyvessel, which he began designing before the war, will be a true submarine, as free-swimming as a mackerel.
- Here the surface swarms with "krill," or free-swimming crustaceans, which they strain out of the water with the whalebone sieves in their mouths.