a form of spring consisting of a wire coiled in a helix.
- Spiral staircase
noun 1. a staircase constructed around a central axis
- Spiral valve
spiral valve n. See spiral fold of cystic duct.
- Spiral vein of modiolus
spiral vein of modiolus n. A vein in the modiolus of the cochlea that is a tributary to the labyrinthine vein and the vein of the cochlear canal.
noun 1. fricative (def 2). adjective 2. Also, spirantal [spahy-ran-tl] /spaɪˈræn tl/ (Show IPA). fricative. adjective 1. (phonetics) another word for fricative noun 2. a fricative consonant