Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
spīco, no perf., ātum, 1, v. a. [spica], to furnish with spikes or ears (post-Aug., and usually in the part. perf.): grana in stipulā crinito textu spicantur, shoot out or put forth ears, Plin. 18, 7, 10, § 60: chamaecissos spicata est tritici modo, id. 24, 15, 84, § 135: herbarum spicatarum genus, id. 21, 17, 61, § 101: testacea spicata, a pavement of bricks, laid in the shape of ears of corn, Vitr. 7, 1 med.; Plin. 36, 25, 62, § 187: quam longa exigui spicant hastilia dentes, sharpen to a point, Grat. Cyn. 118: spicatae faces, id. ib. 484: animantes spicatae aculeis, Min. Octav. 17 fin.