Is there such a thing as a prelaw degree?

Actually, no. Law school admission committees (aided by the filtering process provided by the Law School Data Assembly Service, LSDAS), look at a variety of factors, including the major/concentration of the applicant, and the GPA (where applicable), as well as the rigor of undergraduate programs.

As times evolve and students' preferences change (often in response to the demands of the labor markets and other economic and technological developments), the major/concentrations that gain popularity also follow suit. For example, students with business-related undergraduate degrees constitute an increasingly significant portion of law school students.