Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  mushroom(noun) common name for an edible agaric (contrasting with the inedible toadstool) 2  mushroom(noun) mushrooms and related fleshy fungi (including toadstools, puffballs, morels, coral fungi, etc.)
A cornea transplant is an operation used to remove all or part of a damaged cornea and replace it with healthy cornea tissue from the eye of a suitable donor. A cornea transplant is an operation used to remove all or part of a damaged cornea and replace it with healthy cornea tissue from the eye of a suitable donor.
Because the cornea is as smooth and clear as glass, but is strong and durable, it helps the eye in two ways: 1  It helps to shield the rest of the eye from germs, dust, and other harmful matter. 2  The cornea acts as the eyeâs outermost lens. It helps to shield the rest of the eye from germs, dust, and other harmful matter. 2  The cornea shares this protective task with the eyelids, the eye socket, tears, and the white part of the eye (sclera). 3  The cornea acts as the eyeâs outermost lens.