Quick Quiz: Nouns Score: Change category, Flip order Reset Correct! Noun: compactness Your choice? any of several plants having leaves so arranged on the axis as to indicate the cardinal points of the compass a blood test in which a sample of serum is exposed to a particular antigen and complement in order to determine whether or not antibodies to that particular antigen are present; used as a diagnostic test the quality of being intricate and compounded the spatial property of being crowded together