Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ctēsĭbĭus, i, m.,
- I. a mechanic of Alexandria, distinguished for his inventions in hydraulics, Vitr. 9, 6 (al. 9), p. 280 Bip.
Hence,
- II. Ctēsĭbĭcus, a, um, adj., of Ctesibius: machina, Vitr. 10, 12.