Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cippus (cīpus), i, m. [kindr. with scipio; cf. σκήπτω], a pale, stake, post, pillar, Lucil. ap. Fest. p. 258; and specif.,
Cīpus (Cippus), i, m., a fabled Roman prœtor, upon whose head horns grew suddenly, Ov. M. 15, 565; Plin. 11, 37, 45, § 123; Val. Max. 5, 6, 3.