Definition is a rhetorical mode that can be used in something smaller or shorter than a full paper. You can use extended definition for several paragraphs only in a paper of much greater length. You also can add to a paper a one-paragraph definition--like a brief encyclopedia definition.
The research group, headed by Dr. Lukas Sommer at the Swiss Federal Institute of Technology, has identified a heretofore unknown role for the TGF cell-to-cell signaling pathway in the pathogenesis of DiGeorge syndrome.
This page provides all possible meanings and translations of the word digeorge syndrome. DiGeorge syndrome(ProperNoun) A syndrome caused by the deletion of a small piece of chromosome 22 in humans, associated with various birth defects.