Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ap-posco (adp-), ĕre, v. a., to demand in addition to something (only in the two foll. exs.): haec talenta dotis adposcunt duo, * Ter. Heaut. 4, 7, 10 Bentl. and Ruhnk.: si plus apposcere visus (est), * Hor. Ep. 2, 2, 100.