The Collaborative International Dictionary of English v.0.48:

lawrencium \lawrencium\ n. [from Ernest O. Lawrence, inventer of
   the cyclotron.]
   A transuranic element of atomic number 103. It was discovered
   in 1961 by bombardment of californium in a cyclotron with
   boron nuclei. Other isotopes were prepared in 1965 at Dubna.
   The atomic weight of the most stable isotope is 256, having a
   half-life of 35 seconds. Symbol Lr. --HCP61

   Syn: Lr.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Lr \Lr\ n.
   The chemical symbol for lawrencium, a transuranic element
   of atomic number 103.

   Syn: lawrencium.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

lawrencium
    n 1: a radioactive transuranic element synthesized from
         californium [syn: lawrencium, Lr, atomic number 103]

The Elements (07Nov00):

lawrencium
Symbol: Lr
Atomic number: 103
Atomic weight: (262)
Appearance unknown, however it is most likely silvery-white or grey
and metallic. Lawrencium is a synthetic rare-earth metal. There are
eight known radioisotopes, the most stable being Lr-262 with a half-life
of 3.6 hours. Due to the short half-life of lawrencium, and its
radioactivity, there are no known uses for it. Identified by Albert
Ghiorso
in 1961 at Berkeley. It was produced by bombarding californium with
boron
ions. The name is temporary IUPAC nomenclature, the origin of the name
comes from Ernest O. Lawrence, the inventor of the cyclotron. If
sufficient
amounts of lawrencium were produced, it would pose a radiation hazard.