NOUN (1)

1. (genetics) an organism or cell having the normal amount of DNA per cell; i.e., two sets of chromosomes or twice the haploid number;


ADJECTIVE (1)

1. of a cell or organism having two sets of chromosomes or twice the haploid number;
- Example: "diploid somatic cells"

The Collaborative International Dictionary of English v.0.48:

diploid \dip"loid\ (d[i^]p"loid), n. [Gr. diplo`os twofold +
   -oid.]
   1. (Crystallog.) A solid bounded by twenty-four similar
      quadrilateral faces. It is a hemihedral form of the
      hexoctahedron.
      [1913 Webster]

   2. (Biol.) a cell or organism having a number of chromosomes
      corresponding to two copies of each chromosome; a diploid
      cell or organism.
      [PJC]

            A: I'm not interested in diploids.
            B: Oh, how I wish your parents had felt the same
            way!

The Collaborative International Dictionary of English v.0.48:

diploid \dip"loid\ (d[i^]p"loid), a. [Gr. diplo`os twofold +
   -oid.] (Biol.)
   having a number of chromosomes corresponding to two copies of
   each chromosome; having double the basic number of
   chromosomes, as seen in a haploid cell. Contrasted to
   haploid and polyploid.

   Note: in diploid cells, although the number of chromosomes is
         double that in haploid cells, it is not always true
         that there are two copies of every chromosome, since
         the two sex chromosomes in males will differ from each
         other. In females, and for other chromosomes, however,
         there are generally two copies of each, giving rise to
         the classical hereditary and sorting patterns of
         Mendelian genetics.
         [PJC]

WordNet (r) 3.0 (2006):

diploid
    adj 1: of a cell or organism having two sets of chromosomes or
           twice the haploid number; "diploid somatic cells" [ant:
           haploid, haploidic, monoploid, polyploid]
    n 1: (genetics) an organism or cell having the normal amount of
         DNA per cell; i.e., two sets of chromosomes or twice the
         haploid number