Buttercup (noun)

1. A yellow or white wildflower with a cup-shaped corolla, belonging to the genus Ranunculus.
2. A term of endearment used to address someone in a playful or affectionate way.

Origin:

From middle english buttercuppe, from butter (referring to the yellow color of the flower) + cup (referring to the shape of the flower).

Examples:

1. The buttercup is a common wildflower that grows in meadows and fields.
2. She picked a buttercup and put it in her hair.
3. The buttercup is a beautiful flower that is often used in bouquets.
4. He called her buttercup as a term of endearment.
5. The buttercup is a symbol of cheerfulness and happiness.