Artificial intelligent assistant

hypogeal

hypogeal, a.
  (hɪpəʊ-, haɪpəʊˈdʒiːəl)
  Also -gæal.
  [f. as next + -al1. The form hypogæal is perh. after late Attic ὑπόγαιος, f. γαῖα earth.]
  = hypogean, subterranean.

1686 Plot Staffordsh. 80 Hypogeal heats or Estuaries. 1886 Athenæum 7 Aug. 182/3 This Roman site..is certain to reveal a rich hypogeal harvest. 1898 Ibid. 19 Feb. 252/1 The arrangement of the bundles in the fleshy hypogaeal cotyledons.

Oxford English Dictionary

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