Protuberant \Pro*tu"ber*ant\, a. [L. protuberans, -antis, p. pr. of protuberare. See {Protuberate}.] Prominent, or excessively prominent; bulging beyond the surrounding or adjacent surface; swelling; as, a protuberant joint; a protuberant eye. -- {Pro*tu"ber*ant*ly}, adv.