MLA style, which follows Merriam-Webster, does not use hyphens after most prefixes. We would write, for example, antiestablishment, coauthor, nonlinear, and prealgebra. A hyphen is needed, however, before a capital letter (pre-Renaissance), when the term would be hard to recognize otherwise (anti-intellectual), and to avoid misreading (the hyphen in re-cover, meaning “cover again,” distinguishes the term from recover, meaning “recuperate”).