CALLUS

(Lat.), n. m. Ka2l(kasl)'lu3s(lu4s). Gr., rvAos, n-wpos. Fr cat. Ger., Schwiele, Knochennarbe (3d clef.). It., Sp., callo. 1 A callosity (2d def.), especially one due to thickening of the epidermis from friction. 2. In botany, any part of a plant that has become hard and tough; a hard protuberance (verruca); in certain Fungi, the hymenium. 3. The plastic material which is exuded between and about the ends of a fractured bone in the proce of repair. [A, 301, 322; B, 19, 121, 123; C; E.] Aeu erer C. (Ger.). See Provisional c. C'bildung (Ger.). The formation of c [L 43.] C'wucherung (Ger.). An over-production of c. [L, 80 ] Definitive c. See Permanent c. Ens lie a thing c. [Paget], External c. See Provisional c. Interior c., Internal c. Fr.. cal interne. Ger., innerer C. Provisional c. deposited in the medullary canal of a fractured bone. [Paget (L).J Interposed c., Knochen-C. (Ger.). Fr., cal a'interposition. See Permanent c. Mark-C. (Ger.). See Internal c. Mittlerer C. (Ger.), Permanent c. Fr., cal def in it if. Ger., def in it i ver C. The c. which is deposited between the ends of a broken bone and is ultimately converted into new bone serving for the permanent repair of the fracture. [A, 385; E.] Provisional c., Temporary c. Fr., cal proviso ire [Dupuytren] (ou mow). Ger., provisor is cher C. The c. deposited around a fracture and within the medullary canal, serving the temporary purpose of holding the fragments in position until union has taken place, after which it is absorbed. Little if any such c. is formed when the fragments are kept steadily in apposition. [A, 301, 385; E.] [s. 33]