A buttercup is a small wildflower with bright, shiny yellow petals that grows in meadows, fields, and along roadsides. The flowers are so glossy they almost look like they've been polished with butter, which is how they got their name. If you've ever held a buttercup under someone's chin and seen a yellow glow reflected on their skin, you've participated in an old tradition: people say that if the yellow reflects, it means you like butter.

Buttercups belong to a large family of plants found across North America and Europe. While they're cheerful to look at, most buttercups contain chemicals that make them taste bitter and can irritate skin or upset stomachs if eaten, so animals and people generally leave them alone. This natural defense helps explain why buttercups thrive in pastures where other wildflowers get eaten by grazing animals.

The word buttercup is also used as an affectionate nickname, like when someone calls a child “little buttercup.” It suggests something sweet and golden, though the actual flower is tougher and more resilient than its delicate appearance might suggest.