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also rhachio-, before vowels rachi-, word-forming element meaning “spinal,” from Greek rhakhis “spine, ridge, rib of a leaf.” Cf. Greek rhakhos “thorn hedge.”

rachio- or rachi-
Spine; spinal: rachiometer.


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  • Rachiometer

    rachiometer ra·chi·om·e·ter (rā’kē-ŏm’ĭ-tər) n. An instrument for measuring the curvature of the spinal column.

  • Rachiotomy

    /ˌreɪkɪˈɒtəmɪ/ noun 1. another name for laminectomy rachiotomy ra·chi·ot·o·my (rā’kē-ŏt’ə-mē) n. See laminectomy.

  • Rachis

    [rey-kis] /ˈreɪ kɪs/ noun, plural rachises, rachides [rak-i-deez, rey-ki-] /ˈræk ɪˌdiz, ˈreɪ kɪ-/ (Show IPA) 1. Botany. 2. Ornithology. the part of the shaft of a feather bearing the web. 3. Anatomy. . /ˈreɪkɪs/ noun (pl) rachises, rhachises, rachides, rhachides (ˈrækɪˌdiːz; ˈreɪ-) 1. (botany) the main axis or stem of an inflorescence or compound leaf […]

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