Dug out of the earth: as, fossil coal; fossil salt.Pertaining to or resembling fossils; preserved by natural inhumation, as an organic body, in form and sometimes in texture: as, fossil shells, bones, or wood. See II., 2.Figuratively, antiquated; superannuated; outgrown; belonging to a past epoch or discarded system: as, a fossil statesman; fossil manners or literature.n. Any rock or mineral, or any mineral substance, whether of an organic or of an inorganic nature, dug out of the ground.n. Specifically, in later geological and mineralogical use, anything which has been buried beneath the surface of the earth by natural causes or geological agencies, and which bears in its form or chemical composition the evidence that it is of organic origin.n. Hence, figuratively, one who or something which is antiquated, or has fallen behind the progress of ideas; a person or thing of superannuated or discarded character or quality: as, a curious literary fossil.