Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Double or twofold.
  • adjective Genetics Having a pair of each type of chromosome, so that the basic chromosome number is doubled.
  • noun A cell, organism, or group of organisms having a diploid number of chromosomes.

from The Century Dictionary.

  • noun In crystallography, a solid belonging to the isometric system, with 24 trapezoidal planes. It is the parallel-hemihedral form of the hexoctahedron. Also called dyakis-dodecahedron.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Crystallog.) A solid bounded by twenty-four similar quadrilateral faces. It is a hemihedral form of the hexoctahedron.
  • noun (Biol.) a cell or organism having a number of chromosomes corresponding to two copies of each chromosome; a diploid cell or organism.
  • adjective (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective cytology Of a cell, having a pair of each type of chromosome, one of the pair being derived from the ovum and the other from the spermatozoon. Most somatic cells of higher organisms are diploid.
  • noun A cell which is diploid.
  • noun An organism with diploid cells.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek diploos, double; see dwo- in Indo-European roots + –oid.]

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