The Collaborative International Dictionary of English v.0.48:

Olive \Ol"ive\, n. [F., fr. L. oliva, akin to Gr. ?. See Oil.]
   1. (Bot.)
      (a) A tree (Olea Europaea) with small oblong or
          elliptical leaves, axillary clusters of flowers, and
          oval, one-seeded drupes. The tree has been cultivated
          for its fruit for thousands of years, and its branches
          are the emblems of peace. The wood is yellowish brown
          and beautifully variegated.
      (b) The fruit of the olive. It has been much improved by
          cultivation, and is used for making pickles. Olive oil
          is pressed from its flesh.
          [1913 Webster]

   2. (Zool.)
      (a) Any shell of the genus Oliva and allied genera; --
          so called from the form. See Oliva.
      (b) The oyster catcher. [Prov. Eng.]
          [1913 Webster]

   3.
      (a) The color of the olive, a peculiar dark brownish,
          yellowish, or tawny green.
      (b) One of the tertiary colors, composed of violet and
          green mixed in equal strength and proportion.
          [1913 Webster]

   4. (Anat.) An olivary body. See under Olivary.
      [1913 Webster]

   5. (Cookery) A small slice of meat seasoned, rolled up, and
      cooked; as, olives of beef or veal.
      [1913 Webster]

   Note: Olive is sometimes used adjectively and in the
         formation of self-explaining compounds; as, olive
         brown, olive green, olive-colored, olive-skinned, olive
         crown, olive garden, olive tree, olive yard, etc.
         [1913 Webster]

   Bohemian olive (Bot.), a species of Elaeagnus (Elaeagnus
      angustifolia), the flowers of which are sometimes used in
      Southern Europe as a remedy for fevers.

   Olive branch.
      (a) A branch of the olive tree, considered an emblem of
          peace.
      (b) (Fig.): A child.

   to hold out an olive branch, to offer to make peace (with a
      rival or enemy).

   Olive brown, brown with a tinge of green.

   Olive green, a dark brownish green, like the color of the
      olive.

   Olive oil, an oil expressed from the ripe fruit of the
      olive, and much used as a salad oil, also in medicine and
      the arts.

   Olive ore (Min.), olivenite.

   Wild olive (Bot.), a name given to the oleaster or wild
      stock of the olive; also variously to several trees more
      or less resembling the olive.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

olive branch
    n 1: something offered to an adversary in the hope of obtaining
         peace [syn: peace offering, olive branch]

U.S. Gazetteer Places (2000):

Olive Branch, MS -- U.S. city in Mississippi
   Population (2000):    21054
   Housing Units (2000): 7935
   Land area (2000):     36.193733 sq. miles (93.741334 sq. km)
   Water area (2000):    0.086148 sq. miles (0.223122 sq. km)
   Total area (2000):    36.279881 sq. miles (93.964456 sq. km)
   FIPS code:            54040
   Located within:       Mississippi (MS), FIPS 28
   Location:             34.963007 N, 89.841627 W
   ZIP Codes (1990):     38654
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Olive Branch, MS
    Olive Branch