mastic

n [U] 1 gum or resin from the bark of certain trees, used in making varnish 乳香树脂. 2 type of pliable cement used for waterproofing joints in window-frames, roofs, etc 胶合铺料, 胶粘水泥（作窗框、 屋顶等填缝防水用的）.

massively, massiveness, massless, mast, mast-head, mastectomy, mastemaster, master, master class, Master of Ceremonies, master sergeant, Master's degree (also Master's), master-key, master-stroke, masterful, masterfully, masterly, mastermind, masterpiece, mastery, masticate, mastication, mastiff, mastitis, mastodon, mastoid, mastoiditis, masturbate, masturbation, masturbatory, mat, matador, match, match point, matchbox, matched, matchless, matchmaker, matchmaking, matchstick,