معنى كلمة تحدب في القاموس

CLOCK OR WATCH GLASSES AND SIMILAR GLASSES, GLASSES FOR NON-CORRECTIVE OR CORRECTIVE SPECTACLES, CURVED, BENT, HOLLOWED OR THE LIKE, NOT OPTICALLY WORKED; HOLLOW GLASS SPHERES AND THEIR SEGMENTS, FOR THE MANUFACTURE OF SUCH GLASSES

WOOD (INCLUDING STRIPS AND FRIEZES FOR PARQUET FLOORING, NOT ASSEMBLED) CONTINUOUSLY SHAPED (TONGUED, GROOVED, REBATED, CHAMFERED, V-JOINTED, BEADED, MOULDED, ROUNDED OR THE LIKE) ALONG ANY OF ITS EDGES, ENDS OR FACES, WHETHER OR NOT PLANED, SANDED OR END