Merriam-Webster Collegiate Dictionary - adenoid

 I. noun  Etymology: Greek adenoeides glandular, from aden  Date: circa 1890 either of two abnormally enlarged masses of lymphoid tissue at the back of the pharynx that usually obstruct the nasal and ear passages; also such a mass when not abnormally enlarged — usually used in plural  II. adjective  Date: circa 1947  1. of or relating to the ~s  2. relating to, affected with, or associated with abnormally enlarged ~s a severe ~ condition ~ facies