Definition: The "arbuscle" refers to a single cell in plants, which serves as a structure for the growth and development of a flower. It's shaped like an apple with two parts: a green center with some white pigment or cells (known as stellate cells) that absorb sunlight through a leaf-like structure called stomata. This "arbuscle" structure helps to regulate water and carbon dioxide levels inside the plant, enabling it to bloom in the spring.