0 any animal that has a soft body, no spine, and is often covered with a shell. Many mollusks live in water: --
Oysters are mollusks, as are snails and cuttlefish.
1 any of a large group of animals that have soft bodies, no spine (= supporting bones), and usually a hard shell: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
We kunnen het stap voor stap voltooien, hoe lang de weg ook is en het kan niet worden voltooid, hoe kort de weg ook is, als je niet eens je voetafdruk markeert.