Cauldron - Used to brew and hold potions. Can be made of copper, brass, pewter, silver or gold. If a cauldron is too thin the potion may cause the cauldron to melt and leak.

Cauldron Cake - Popular wizarding cake variant. A chocolate, cauldron shaped cake possibly filled with icing.

Centaur - A magical creature whose head, arms and torso are of human form and are joined to the body and legs of a horse. They are their own species and not a type of half-breed. Despite possessing human intelligence, they are classed as Beasts by the Ministry of Magic at their own request. They live in the forest and are known to be skilled at healing, Divination, archery and Astronomy.

Centaur Tears - A drink for most plants. Has more vitamins than water and can revive a plant which is moments from death. However, they are toxic to plants which grow in salt water.

Charms - Spells which add certain properties to an object or creature. Different to transfiguration because they focus on altering what the object does rather than what it is.

Chaser - Pass the Quaffle to one another and try to throw it through the opposite teams hoops. See 'Quidditch'

Chinese Fireball - Scarlet coloured dragon which produces mushroom-shaped flames. See 'Dragon'

Chocolate Frogs - Popular confection sold in the wizarding world. The chocolate frogs are animated to act like real frogs. They are packaged with collectible famous wizards and witches cards.

Class-A Transfigurative Spell - A core foundation to the magical practices of Transfiguration. They hold the primary principles, practices and proper technique for anyone beginning to learn transfiguration. 

Cleansweep - A more popular, affordable broom make. See 'Broomstick'

Common Welsh Green - Green dragon which lives in the mountains in Wales. Relatively subdued breed with a melodious roar. See 'Dragon'

Compound - A chemical combination where properties of ingredients have changed. For example, the heat of the oven will change ingredients to make a cake, but then the cake cannot be changed back to its ingredients.

Constellation - Group of stars that make an imaginary image. They are traditionally named after their apparent form or a mythological figure. 

Cure - A type of potion which ends a disease or condition through the use of a remedy. Different to an antidote because they can't prevent or protect and will only cure after the damage has been done, usually used for natural illnesses.

Cure for Boils - See 'Boil-Cure Potion'