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

segment \seg"ment\, n. l. segmentum, fr. secare to cut, cut
   off: cf. f. segment. see saw a cutting instrument.
   1. one of the parts into which any body naturally separates
      or is divided; a part divided or cut off; a section; a
      portion; as, a segment of an orange; a segment of a
      compound or divided leaf.
      1913 webster

   2. geom. a part cut off from a figure by a line or plane;
      especially, that part of a circle contained between a
      chord and an arc of that circle, or so much of the circle
      as is cut off by the chord; as, the segment acb in the
      illustration.
      1913 webster

   3. mach.
      a a piece in the form of the sector of a circle, or part
          of a ring; as, the segment of a sectional fly wheel or
          flywheel rim.
      b a segment gear.
          1913 webster

   4. biol.
      a one of the cells or division formed by segmentation,
          as in egg cleavage or in fissiparous cell formation.
      b one of the divisions, rings, or joints into which many
          animal bodies are divided; a somite; a metamere; a
          somatome.
          1913 webster

   segment gear, a piece for receiving or communicating
      reciprocating motion from or to a cogwheel, consisting of
      a sector of a circular gear, or ring, having cogs on the
      periphery, or face.

   segment of a line, the part of a line contained between two
      points on it.

   segment of a sphere, the part of a sphere cut off by a
      plane, or included between two parallel planes.

   ventral segment. acoustics see loor, n., 5.
      1913 webster
see also:
saw segment gear segment of a line segment of a sphere ventral segment loor 

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

loop \loop\, n. cf. ir.  gael. lub loop, noose, fold, thong,
   bend, lub to bend, incline.
   1. a fold or doubling of a thread, cord, rope, etc., through
      which another thread, cord, etc., can be passed, or which
      a hook can be hooked into; an eye, as of metal; a staple;
      a noose; a bight.
      1913 webster

            that the probation bear no hinge, nor loop
            to hang a doubt on.                   --shak.
      1913 webster

   2. a small, narrow opening; a loophole.
      1913 webster

            and stop all sight-holes, every loop from whence
            the eye of reason may pry in upon us. --shak.
      1913 webster

   3. a curve of any kind in the form of a loop.
      1913 webster

   4. telegraphy a wire forming part of a main circuit and
      returning to the point from which it starts.
      1913 webster

   5. acoustics the portion of a vibrating string, air column,
      etc., between two nodes; -- called also ventral segment.
      1913 webster

   loop knot, a single knot tied in a doubled cord, etc. so as
      to leave a loop beyond the knot. see illust. of knot.
      1913 webster
see also:
ventral segment loop knot knot 

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

ventral \ven"tral\, a. l. ventralis, fr. venter the belly;
   perhaps akin to g. wanst: cf. f. ventral.
   1. anat. of, pertaining to, or situated near, the belly, or
      ventral side, of an animal or of one of its parts; hemal;
      abdominal; as, the ventral fin of a fish; the ventral root
      of a spinal nerve; -- opposed to dorsal.
      1913 webster

   2. bot.
      a of or pertaining to that surface of a carpel, petal,
          etc., which faces toward the center of a flower.
      b of or pertaining to the lower side or surface of a
          creeping moss or other low flowerless plant. opposed
          to dorsal.
          1913 webster

   ventral fins zool., the posterior pair of fins of a fish.
      they are often situated beneath the belly, but sometimes
      beneath the throat.

   ventral segment. acoustics see loop, n., 5.
      1913 webster
see also:
dorsal ventral fins ventral segment loop 

Ventral >> V Words
Ventral, definition of term: Ventral
ventral_pag1.html

Segment >> S Words
Segment, definition of term: Segment
segment_pag1.html