yt·ter·bi·um ( -tûr b - m)n. Symbol Yb A soft, bright, silvery rare-earth element occurring in two allotropic forms and used as an x-ray source for portable irradiation devices, in some laser materials, and in some special alloys. Atomic number 70; atomic weight 173.04; melting point 824°C; boiling point 1,196°C; specific gravity 6.972 or 6.54 (25°C) depending on allotropic form; valence 2, 3. See Table at element. [After Ytterby, a town in Sweden.] yt·ter bic (-bk) adj. |
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