A cadaver is a dead body - this term is generally used for bodies that have been donated to medicine or science.
Donating tissues for transplant
Donors offer their bodies altruistically to be used to benefit others. Many are used for dissection in medical schools and for practising surgical procedures like arthroscopy. Stored cadaver materials are taken from many parts of the body and are stored by methods such as cryo-preservation and lyophilisation.
Preservation and sterilization methods of the meniscal allografts: literature review. Mickiewicz P, Binkowski M, Bursig H and Wróbel Z. Cell Tissue Bank. 2014; 15(3): 307–317.