NCI Dictionary of Cancer Terms The NCI Dictionary of Cancer Terms features 8,535 terms related to cancer and medicine. We offer a widget that you can add to your website to let users look up cancer-related terms. Get NCI’s Dictionary of Cancer Terms Widget. The search textbox has an autosuggest feature. When you enter three or more characters, a list of up to 10 suggestions will popup under the textbox. Use the arrow keys to move through the suggestions. To select a suggestion, hit the enter key. Using the escape key closes the listbox and puts you back at the textbox. The radio buttons allow you to toggle between having all search items start with or contain the text you entered in the search box. Starts with Contains Browse: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # thymus listen (THY-mus) An organ that is part of the lymphatic system, in which T lymphocytes grow and multiply. The thymus is in the chest behind the breastbone. More Information Thymoma and Thymic Carcinoma Enlarge Anatomy of the thymus gland. The thymus gland is a small organ that lies in the upper chest under the breastbone. It makes white blood cells, called lymphocytes, which protect the body against infections.
