Those bits of wood that come with a canvas are called canvas keys, and are for ensuring the canvas remains tight. Photo Â© Marion Boddy-Evans.Licensed to About.com, Inc.f youâve bought an unprimed ready-made canvas, or are stretching your own, donât use keys until after youâve primed the canvas, as priming makes the it more rigid. Some canvases are made with rigid corners, without the option of hammering in a wedge or key.
meâ¢tasâ¢taâ¢sis. a. the spread of disease-producing organisms or of malignant or cancerous cells to other parts of the body by way of the blood or lymphatic vessels or membranous surfaces. b. the condition produced by this. metastasis metÃ¡stasis a. Changing see -, meta ]. stasis
Cancer refers to any one of a large number of diseases characterized by the development of abnormal cells that divide uncontrollably. Many cancers have the ability to infiltrate and destroy normal body tissue and organs. When cancer cells spread throughout the body, this is called metastasis. Once cancer metastasizes, it may become deadly. Depending upon the type and location of the disease, the presence and growth of cancer can be dangerous.