portabella

[pawr-tuh-bel-uh]

noun

a very large, rich-flavored cremini mushroom, often grilled, broiled, or sautéed.

Also portobello, por·ta·bel·lo [pawr-tuh-bel-oh, pohr-] /ˌpɔr təˈbɛl oʊ, ˌpoʊr-/.