This paper aims at examining the peculiarities of term formation in the specialized languages, providing relevant examples from the domain of biomedical engineering which, representing a mix between medicine and engineering, offers a wide variety of scientific and technical terminology to illustrate the term formation patterns and methods presented. Largely based of the works of Juan C. Sager, one of the most influential researchers in the domain of terminology, the paper aims at explaining and describing the main approaches and mechanisms of term formation, as well as the importance and function of each method in special reference and designation of concepts as required by classificatory function of the specialized languages, precision of expression and systematic reference. Therefore, it is of absolute importance to differentiate between primary and secondary term formation patterns, as well as to specify that terms can be the product of use of existing linguistic resources expressed through the extension of meaning of a an existing term, modification of existing linguistic resources expressed through derivation, compounding, conversion and compression, and creation of new linguistic entities expressed through borrowing and calques or loan translations, each of those approaches having a specific purpose and a place in the specialized designation of concepts, and creating the terminological structure of a specialized domain.