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Children's Dictionary
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.