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

sounding \sound"ing\, n.
   1. the act of one who, or that which, sounds in any of the
      senses of the several verbs.
      1913 webster

   2. naut. from sound to fathom.
      a measurement by sounding; also, the depth so
          ascertained.
      b any place or part of the ocean, or other water, where
          a sounding line will reach the bottom; -- usually in
          the plural.
      c the sand, shells, or the like, that are brought up by
          the sounding lead when it has touched bottom.
          1913 webster

   sounding lead, the plummet at the end of a sounding line.
      

   sounding line, a line having a plummet at the end, used in
      making soundings.

   sounding post mus., a small post in a violin,
      violoncello, or similar instrument, set under the bridge
      as a support, for propagating the sounds to the body of
      the instrument; -- called also sound post.

   sounding rod naut., a rod used to ascertain the depth of
      water in a ship's hold.

   in soundings, within the eighty-fathom line. --ham. nav.
      encyc.
      1913 webster
see also:
sound sounding lead sounding line sounding post sound post sounding rod 
in soundings 

[2] : WordNet (r) 2.0

sounding line
     n : nautical plumb line for determining depth syn: lead line
see also:
lead line 

Bar Line >> B Words
Bar Line, definition of term: Bar Line
bar+line_pag1.html

Air Line >> A Words
Air Line, definition of term: Air Line
air+line_pag1.html

Agate Line >> A Words
Agate Line, definition of term: Agate Line
agate+line_pag1.html

Aclinic Line >> A Words
Aclinic Line, definition of term: Aclinic Line
aclinic+line_pag1.html