polychlorinated

As a noun initialism

is a term formed from the initial letter or letters of several words or parts of words, but which is itself pronounced letter by letter.

As an adjective polychlorinated is

(chemistry) having many hydrogen atoms replaced by chlorine.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective polychlorinated is

(chemistry) having many hydrogen atoms replaced by chlorine.

Polychlorinated is a related term of polyhalogenated.

As adjectives the difference between polychlorinated and polyhalogenated

is that polychlorinated is (chemistry) having many hydrogen atoms replaced by chlorine while polyhalogenated is with multiple halogen atoms.