hyaluronidase
an enzyme that catalyzes the hydrolysis of hyaluronic acid, the 'cement material' of connective tissues; it is found in leeches, snake and spider venom, in testes, and is produced by various pathogenic bacteria, enabling them to spread through tissue. A preparation from mammalian testes is used to promote absorption and diffusion of solutions injected subcutaneously. When hyaluronidase is mixed with fluids administered subcutaneously, absorption is more rapid and less uncomfortable. Hyaluronidase should not be given in areas where there is infection. Since it hastens absorption, it must be given with caution when administered with toxic drugs, as the toxic reaction can occur very rapidly.