2. Noun. an organelle ¹
¹ Source: wiktionary.com
Medical Definition of Organoid
1. 1. Resembling in superficial appearance or in structure any of the organs or glands of the body. 2. Composed of glandular or organic elements, and not of a single tissue; pertaining to certain neoplasms (e.g., an adenoma) that contain cytologic and histologic elements arranged in a pattern that closely resembles or is virtually identical to a normal organ. See: histoid. Synonym: organelle. Origin: organo-+ G. Eidos, resemblance (05 Mar 2000)