Tur·ban-top n. Bot. A kind of fungus with an irregularly wrinkled, somewhat globular pileus (Helvella esculenta syn. Gyromitra esculenta.).
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Gyromitra esculenta
n : a poisonous gyromitra; the surface of the fertile body is
smooth at first and becomes progressively undulating and
wrinkled (but never truly pitted); color varies from dull
yellow to brown [syn: brain mushroom, beefsteak morel]