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| cartilage |
a tough, white tissue that forms part of the skeleton of humans and other animals. Cartilage is not as stiff as bone. Cartilage is found in the ear, nose, and joints. |
| crocodile |
a large reptile that is found in tropical swamps. It has a thick, tough skin, a long tail, and a long, pointed snout. |
| cuticle |
the tough, dead skin along the bottom edge and sides of the fingernails and toenails. |
| difficult |
filled with many tough problems or pain. [1/3 definitions] |
| hard |
not soft; solid; firm; tough. [1/9 definitions] |
| hard-boiled |
(informal) not moved by feelings; tough. [1/2 definitions] |
| harden |
to make tough or uncaring. [1/3 definitions] |
| hardy |
able to stand hardship; tough; brave. [1/2 definitions] |
| hoof |
the hard, tough covering on the feet of certain mammals such as horses, pigs, and deer. [1/2 definitions] |
| ligament |
a band of tough tissue that connects bones or supports muscles or organs. |
| nut |
a dry seed or fruit made up of a kernel contained in a hard, tough shell. The kernel of a nut is often used as food. The kernal is often called the "meat" of the nut. [1/4 definitions] |
| oak |
a tough, lasting wood that comes from a tree that belongs to the beech family and bears acorns. [1/2 definitions] |
| pomegranate |
a red fruit with a tough rind and many seeds. The seeds are in a juicy pulp and can be eaten. [1/2 definitions] |
| shark1 |
a fish that lives in the ocean and has tough skin, large jaws and teeth, and a skeleton made of cartilage. Most sharks eat other fish. |
| tender1 |
easily chewed or crushed; not tough; soft. [1/4 definitions] |
| tendon |
a cord or band of tough white tissue that connects a muscle with a bone or other body part; sinew. |
| vinyl |
a tough, shiny plastic made from a resin. Phonograph records, floor coverings, and water pipes are some things that are made of vinyl. |
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