Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* formaster, tri, m. [forma], one who beautifies or adorns himself, a coxcomb, dandy: aut luculentaster aut formaster frigidus, Tit. ap. Fest. s. v. OBSTRVDANT, p. 193 Müll.