Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† phlĕbŏtŏmus (flĕb-), i, m., = φλεβοτόυος, a lancet, a fleam: phlebotomo uti, Cael. Aur. Acut. 2, 19, 121: adhibendus, Theod. Prisc. 2, 21: transverso phlebotomo percutere, Veg. Vet. 1, 19, 1.