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An organization of cells into an organ-like structure. Organoids can be generated in culture. They are also found in certain neoplasms.

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, noting certain tumors, such as adenoma, having a stroma enclosing one or more dissimilar tissues giving it a structure resembling that of a secreting organ; see histoid (2).

Of tumors, resembling an organ. [Gr.]