IPA: /ˈkæt.nɪp/
KK: /ˈkætnɪp/
A type of plant that has a strong smell and is known to attract cats. It belongs to the mint family and is often used for its aromatic properties.
My cat loves to play with the catnip I bought for her.
Catnip is formed from "cat" (from Old English "catt", meaning a domesticated feline) and "nip" (from Middle English "nippen", meaning to pinch or bite). The word refers to a plant that has a stimulating effect on cats, often causing them to playfully nip at it.
Think of a 'cat' being playfully 'pinched' or 'bitten' by the effects of the plant, which is why catnip is so appealing to them.