Artificial intelligent assistant

hypogean

hypogean, a.
  (hɪpəʊ-, haɪpəʊˈdʒiːən)
  [f. L. hypogē-us, ad. Gr. ὑπόγειος underground (f. γῆ earth) + -an. Cf. F. hypogé.]
  Existing or growing beneath the surface of the ground; underground.

1852 Badham in Fraser's Mag. XLVI. 271 Fabricius minutely describes, as belonging to this hypogean race, a fish about one foot in length. 1855 Mayne Expos. Lex., Hypogeus, applied to certain cotyledons which..remain below the ground during germination: hypogean. 1880 C. & F. Darwin Movem. Pl. 27 The cotyledons are hypogean, or never rise above the ground. 1885 Science 26 June 519/1 In any hypogean insect which continually uses its claws in burrowing, the need of shedding and renewal of these organs is apparent. Ibid., The facts regarding the cicada's hypogean life.

Oxford English Dictionary

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