Mat

a thick flat pad used as a floor covering

mounting consisting of a border or background for a picture

sports equipment consisting of a piece of thick padding on the floor for gymnastic sports

a mass that is densely tangled or interwoven

a master's degree in teaching

the property of having little or no contrast

a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete

a small pad of material that is used to protect surface from an object placed on it

twist together or entwine into a confusing mass

change texture so as to become matted and felt-like

not reflecting light