<p><strong>Noun</strong></p><ul><li>Zoology. A sedentary type of animal form characterized by a more or less fixed base, columnar body, and free end with mouth and tentacles, especially as applied to coelenterates.</li><li>An individual zooid of a compound or colonial organism.</li><li>Pathology. A projecting growth from a mucous surface, as of the nose, being either a tumor or a hypertrophy of the mucous membrane.</li></ul>