a. (sb.) Obs. [f. L. subterrāneus (see prec.) + -AL.]

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  A.  adj.

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  1.  Underground; = SUBTERRANEAN a. 1.

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1592.  R. D., Hypnerotomachia, 30. Feareful vaultes, and subterraneal buttresses.

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1639.  G. Plattes (title), A Discovery of Subterraneall Treasure: viz. of all manner of Mines and Mineralls.

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1651.  J. F[reake], Agrippa’s Occ. Philos., 404. Subterraneall and dark Demons.

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1671.  R. Bohun, Disc. Wind, Contents. The 2d Locall Origine of Winds in Generall from the Earth or Seas, as from Submarine or Subterraneall Eruptions.

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1673.  Boyle, Ess. Effluviums, III. 51. The more agile Corpuscles of Subterraneal Salts.

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1681.  Grew, Musæum, I. § ii. i. 14. He catcheth Ant’s by scratching open their subterraneal Hives.

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1690.  C. Nesse, Hist. & Myst. O. & N. Test., I. 7. Mountains not cast up by the flood, nor by the subterraneal spirits.

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1741.  Phil. Trans., LV. 239. The subterraneal damps and mineral spirit of fountains seem … exactly to resemble each other.

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  2.  Belonging to the lower regions; infernal; = SUBTERRANEAN a. 2.

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1651.  T. Stanley, Plat. Disc. Love, 222. The World her self being one, can have but one soul; which as it animates the subterraneal parts, is called Pluto; the sublunary Neptune; the celestial, Jupiter.

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1803.  Shaw, trans. Bacon’s Fables Anc., xi. [Pluto] burrying her to his chariot, carried her with him to the subterraneal regions.

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  B.  sb. pl. Underground strata.

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1652.  French, Yorksh. Spaw, iii. 32. How variously subterranealls communicate their vertues to this Element [viz. water].

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