Spir-
spir- pref.
Variant of spiro-.
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- Spiracle
noun 1. a breathing hole; an opening by which a confined space has communication with the outer air; air hole. 2. Zoology. an aperture or orifice through which air or water passes in the act of respiration, as the blowhole of a cetacean. an opening in the head of sharks and rays through which water […]
- Spiradenoma
spiradenoma spi·rad·e·no·ma (spī-rād’n-ō’mə) n. A benign tumor of the sweat glands.
- Spiraea
noun 1. spirea. noun 1. any of various plants or shrubs belonging to the genus Spiraea, of the rose family, having clusters of small, white or pink flowers, certain species of which are cultivated as ornamentals. noun 1. any rosaceous plant of the genus Spiraea, having sprays of small white or pink flowers See also […]
- Spiral
noun 1. Geometry. a plane curve generated by a point moving around a fixed point while constantly receding from or approaching it. 2. a helix. 3. a single circle or ring of a spiral or helical curve or object. 4. a spiral or helical object, formation, or form. 5. Aeronautics. a maneuver in which an […]
- Spiral-arm
noun, Astronomy. 1. any of the elongated and curved spiral sections that are connected to the center of a spiral galaxy.