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  • (anthropology/archaeology) The base is the proximal or end portion of a knife, tool or projectile point. The base is usually designed for hafting or gripping, but not designed or intended for cutting, scraping or penetrating. Oftentimes, base edges were ground so that sharp edges would not abrade the hafting materials and cause hafting failure with use. The bottom part of a point or knife. Source: LITHICS-Net, Glossary of Lithics Terminology
  • (biotechnology) one of the four chemical units (nucleotides) arranged along the DNA or RNA molecule.
  • (chemistry) A substance that produces OH- (aq) ions in aqueous solution. Strong soluble bases are soluble in water and are completely dissociated. Weak bases ionize only slightly.
  • (geology)
  1. As used by drillers, a line of stakes set by an engineer or drill foreman to be used as a guide to line up and point the drill in a specific compass direction. A line in a survey which, being accurately determined in length and position, serves as the origin for computing the distances and relative positions of remote points and objects by triangulation. See also: base line
  2. A compound, e.g., lime, ammonia, or caustic alkali, or an alkaloid, capable of reacting with an acid to form a salt either with or without elimination of water.
  3. Foundation or supporting structure on which a drill is mounted. Long
  4. See: basal pinacoid; base course.
    Source: Dictionary of Mining, Mineral, and Related Terms

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