The part of speech that modifies a noun or other substantive by limiting, qualifying, or specifying and distinguished in English morphologically by one of several suffixes, such as -able, -ous, -er, and -est, or syntactically by position directly preceding a noun or nominal phrase. Any of the words belonging to this part of speech, such as white in the phrase a white house. Adjectival: an adjective clause. Law Prescriptive; remedial: adjective law. Not standing alone; derivative or dependent.