Of, relating to, or of the nature of merism; affecting the pattern or number of similar parts occurring in the body of an organism.
Of a gametophyte of a fern: that has a meristem, and is capable of producing oogonia as well as antheridia. Also: of, relating to, or of the nature of such a meristem. Contrasted with "ameristic".
Late 19th century (in an earlier sense). From ancient Greek μεριστός divided, divisible (from μερίζειν to divide) + -ic; compare -istic.