ram \ram\ ra^m, n. as. ramm, ram; akin to ohg.  d. ram,
   prov. g. ramm, and perh. to icel. ramr strong.
   1. the male of the sheep and allied animals. in some parts of
      england a ram is called a tup.
      1913 webster

   2. astron.
      a aries, the sign of the zodiac which the sun enters
          about the 21st of march.
      b the constellation aries, which does not now, as
          formerly, occupy the sign of the same name.
          1913 webster

   3. an engine of war used for butting or battering.
      specifically:
      a in ancient warfare, a long beam suspended by slings in
          a framework, and used for battering the walls of
          cities; a battering-ram.
      b a heavy steel or iron beak attached to the prow of a
          steam war vessel for piercing or cutting down the
          vessel of an enemy; also, a vessel carrying such a
          beak.
          1913 webster

   4. a hydraulic ram. see under hydraulic.
      1913 webster

   5. the weight which strikes the blow, in a pile driver, steam
      hammer, stamp mill, or the like.
      1913 webster

   6. the plunger of a hydraulic press.
      1913 webster

   ram's horn.
      a fort. a low semicircular work situated in and
          commanding a ditch. written also ramshorn.
          --farrow.
      b paleon. an ammonite.
          1913 webster
see also:
tup hydraulic ram's horn ramshorn