In JLA the absolute would appear to be מַרְגַּלְיָה‏; elsewhere מרגלי.
  
Page refs. in other dictionaries: DJPA: 327b; DJBA: 704a; Jastrow: 836; Levy Ch-W: 2:66;

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Derivatives:

mrgl, mrglˀ n.m.   a type of gem