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Webster 1913 Edition

Adj.

[L.

terreus

, fr.

terra

the earth. See

Consisting of earth; earthy;

as,

terreous

substances;

terreous

particles

[Obs.]

Adj.

[L. terreus, from terra, earth.] Earthy; consisting of earth; as terreous substances; terreous particles.

terreous ‎(comparative more terreous, superlative most terreous)

(obsolete) Pertaining to earth, earthy.
- 1646, Sir Thomas Browne, Pseudodoxia Epidemica, Folio 2007, p. 333:
  For when the airy intersticies are filled [...] there remains a gross and terreous portion at the bottom