noun
: a lichen of the genus Umbilicaria or of the related genus Gyrophora that has a flat coriaceous blackish thallus, is common on rocks in arctic, subarctic, and north temperate regions, and is used as food in cases of extremity
noun
: a lichen of the genus Umbilicaria or of the related genus Gyrophora that has a flat coriaceous blackish thallus, is common on rocks in arctic, subarctic, and north temperate regions, and is used as food in cases of extremity
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012