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rhomboideal

rhomˈboideal, a. Obs.
  [f. mod.L. rhomboideus + -al1.]
  = rhomboidal 1.

1677 Plot Oxfordsh. 83 The Selenites's of the Rhomboideal Figure. 1692 Ray Creation (ed. 2) 119 Those rhomboideal Selenites found near St. Ives.

Oxford English Dictionary

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