Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word opticus could not be parsed. Trying a normal dictionary lookup:
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obtĭcesco (opt-), tĭcŭi, 3, v. inch. n. [obticeo], to become or be struck silent; in perf., to be silent (syn. obmutesco): obticuit obticescit, Not. Tir. p. 90: quid, amabo, opticuisti? Plaut. Bacch. 1, 1, 28: quid nunc obticuisti? Ter. Phorm. 5, 9, 2 (dub.; Umpfenb. and Fleck. obstipuisti): repente obticuit, Just. 32, 2, 3: nec prius obticuit quam, etc., Ov. M. 14, 523: chorus, Hor. A. P. 284; Mart. 10, 17, 4.
With acc.: cetera obticuit, Lact. Ira Dei, 4, 13.
† optĭcē, ēs, f., = ὀπτική, optics: optices non ignarus, Vitr. 1, 1, 4.