What's the adjective for delineation? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs delineate and deline which may be used as adjectives within certain contexts.
“Layer V was clearly delineable from the cell dense layer VI, which again had a distinct border to the white matter.”
“Certainly the domain fades into less delineable areas such as semantics or pragmatics.”
“A procedure is discussed for realizing some exact analytical eigenfunctions and corresponding eigenfrequencies for vibrating membranes with fixed rectilinear edges delineable on a grid of squares and their diagonals.”