. | 1. | supplementary material at the end of a book, article, document, or other text, usually of an explanatory, statistical, or bibliographic nature. |
| 2. | an appendage. |
| 3. | Anatomy.
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| 4. | Aeronautics. the short tube at the bottom of a balloon bag, by which the intake and release of buoyant gas is controlled. |

| a narrow, blind tube protruding from the cecum, having no known useful function, in humans being 3 to 4 in. (8 to 10 cm) long and situated in the lower right-hand part of the abdomen. |
ap·pen·di·ces (ə-pěn'dĭ-sēz') n. A plural of appendix. |
A small saclike organ located at the upper end of the large intestine. The appendix has no known function in present-day humans, but it may have played a role in the digestive system in humans of earlier times. The appendix is also called the vermiform appendix because of its wormlike (“vermiform”) shape.
appendix ap·pen·dix (ə-pěn'dĭks)
n. pl. ap·pen·dix·es or ap·pen·di·ces (-dĭ-sēz')
A supplementary or an accessory part of an organ or a structure of the body.
The vermiform appendix.
vermiform appendix n.
A wormlike intestinal diverticulum starting from the blind end of the cecum in the lower right-hand part of the abdomen and ending in a blind extremity.