Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Perseus.
sescuplus (sesquiplus, in vett. edd. Plin. 2, 22, 20, § 84, where, however, the best MSS. have sescuplus), a, um, adj. [sesqui], taken once and a half, once and a half as much: ut tempora tria ad duo relata sescuplum faciant, Quint. 9, 4, 47; so Plin. 1. 1.: tempus, Ter. Maur. Syll. pp. 2395 and 2412 P.: ratio, Censor. de Die Nat. 1.