The Collaborative International Dictionary
Investigable
Investigable \In*ves"ti*ga*ble\, a. [L. investigabilis. See
Investigate.]
Capable or susceptible of being investigated; admitting
research.
--Hooker.
Douglas Harper's Etymology Dictionary
investigable
c.1400, from Late Latin investigabilis "that may be searched into," from investigare (see investigation).
Wiktionary
investigable
a. (context chiefly philosophy and science English) Capable of being investigated or study.