Tympanum

tun'pan-iim, n. {anal.) the membrane which separates the external from the internal ear, often called the drum of the ear; (arch.) the triangular space between sloping and horizontal cornices, or in the comers or sides of an arch the pane! of a door [L.— Gr. tympan on, typo non, a kettledrum—typtfi, to strike Type, tip, ». a mark or figure struck or stamped upon something an emblem or figure of something to come, a raised letter, . in metal or wood used in printing; the whole types used in priming a model m nature made the subject of a copy [nat. hist, that which combines best the characteristics of a group irtcd.) the order in which the symptoms of a disease exhibit themselves.- -adj. Typ'aL [Fr. — L. typus Gr. — typos typtO, to.strike.] [casts printers’ type. Typefounder, t!p'fownd-er, «. one who founds or Type-metal, tlp'-met'al, metal used for making types, a compound of lead and antimony,