|grenz ray||medical dictionary|
Very soft X-ray's, closely allied to the ultraviolet ray's in their wavelength (i.e., long) and in their biologic action upon tissues; they are produced by a specially built vacuum tube with a hot cathode operating from a transformer delivering not more than 8 kw.
Origin: Ger. Grenze, borderline, boundary
(05 Mar 2000)
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