[1] : The Collaborative International Dictionary of English v.0.48

lateral \lat"eral\, a. l. lateralis, fr. latus, lateris, side:
   cf. f. lat'eral.
   1. of or pertaining to the sides; as, the lateral walls of a
      house; the lateral branches of a tree.
      1913 webster

   2. anat. lying at, or extending toward, the side; away from
      the mesial plane; external; -- opposed to mesial.
      1913 webster

   3. directed to the side; as, a lateral view of a thing.
      1913 webster

   lateral cleavage crystallog., cleavage parallel to the
      lateral planes.

   lateral equation math., an equation of the first degree.
      obs.

   lateral line anat., in fishes, a line of sensory organs
      along either side of the body, often marked by a distinct
      line of color.

   lateral pressure or stress mech., a pressure or stress
      at right angles to the length, as of a beam or bridge; --
      distinguished from longitudinal pressure or stress.

   lateral strength mech., strength which resists a tendency
      to fracture arising from lateral pressure.

   lateral system bridge building, the system of horizontal
      braces as between two vertical trusses by which lateral
      stiffness is secured.
      1913 webster lateral
see also:
mesial lateral cleavage lateral equation lateral line lateral pressure stress 
lateral strength lateral system 

[2] : WordNet (r) 2.0

lateral line
     n : sense organs of fish and amphibians; believed to detect
         pressure changes in the water syn: lateral line organ
see also:
lateral line organ 

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