What's the adjective for specifier? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs specify and specificate which may be used as adjectives within certain contexts.
(physics) of a value divided by mass (e.g. specific orbital energy)
(physics) similarly referring to a value divided by any measure which acts to standardize it (e.g. thrust specific fuel consumption, referring to fuel consumption divided by thrust)
(physics) a measure compared with a standard reference value by division, to produce a ratio without unit or dimension (e.g. specific refractive index is a pure number, and is relative to that of air)
“Malament’s suggestion […] provides a striking example of how close the descriptive content of the two theories is in at least one precisely specifiable sense.”
“It is always answerable to some set of independently specifiable practical goals.”
“We decry the absence of leadership, but who can lead without a specifiable goal?”