The word "medullar" refers to something related to the medulla, the innermost part of an organ or tissue. Synonyms for this word might include "central," "core," "innermost," "essential," or "fundamental." Other related terms might include "marrow," which also refers to the innermost portion of certain organs, or "intrinsic," which denotes something that is inherent or essential to a particular entity. Depending on the specific context in which the term "medullar" is being used, it may be appropriate to use a synonym that emphasizes the importance or centrality of the medulla or the structures it is associated with.