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monactine

monactine, a.
  (mɒˈnæktɪn)
  [f. (mod.L. type *monactīn-us) Gr. µόνο-ς (see mono-) + ἀκτιν-, ἀκτίς ray.]
  = monactinal a.

1887 W. J. Sollas in Encycl. Brit. XXII. 416 (Fig. 12), Typical megascleres. a, rhabdus (monaxon diactine); b, stylus (monaxon monactine).

Oxford English Dictionary

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