Noun: portobello ,por-tu'be-low
- A large, mature variety of the common button mushroom (Agaricus bisporus) with a meaty texture, rich flavour, and broad, flat cap typically 4-6 inches in diameter
"He grilled portobello mushrooms as a vegetarian alternative to burgers";
- portabella
Derived forms: portobellos
Encyclopedia: Portobello, Panama