| hapalonychia | Thinning of nails resulting in bending and breaking of the free edge, with longitudinal fissures. Synonym: egg shell nail. Origin: hapalo-+ G. Onyx (onych-), nail (05 Mar 2000) |
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| hapantotype | <zoology> One or more preparations of directly related individuals, representing differing stages in the life cycle, together forming a name-bearing type in an extinct species of Protozoa. (09 Jan 1998) |
| haphalgesia | Pain or an extremely disagreeable sensation caused by the merest touch. Synonym: Pitres' sign. Origin: G. Haphe, touch, + algesis, sense of pain (05 Mar 2000) |
| haphazard | Lacking any coherent system, organization, or objective; not to be confused with random or chaotic. (05 Mar 2000) |
| haphazard sampling | The assembly of data in an unprescribed and undefined fashion that allows no sound scientific inferences other than establishing the existence of types. (Finding even one unicorn in such a set would establish that unicorns can exist, but no inference about their prevalence could be made from it.) Cf.: random sample. (05 Mar 2000) |
| haphephobia | <psychology> A morbid dislike or fear of being touched. Synonym: aphephobia. Origin: G. Haphe, touch, + phobos, fear (05 Mar 2000) |
| haplo- | Simple, single. Origin: G. Haplous (05 Mar 2000) |
| haplodont | Having molar teeth with simple crowns, i.e., simple conical teeth without ridges or tubercles. Origin: haplo-+ G. Odous, tooth (05 Mar 2000) |
| haploid | <cell biology, genetics> Describes a nucleus, cell or organism possessing a single set of unpaired chromosomes. Gametes are haploid. (18 Nov 1997) |
| haploid number | <cell biology, genetics> The haploid number is the total number of chromosomes in a single set, such as would be found in a gamete or a haploid somatic cell (such as in fungus or gametophyte plants). In humans, the haploid number would be 23. (09 Oct 1997) |
| haploid set | The genetic content of a normal gamete in which every autosomal locus is represented by a single allele and either one full set of X-linked genes or one full set of Y-linked genes; the normal adult somatic cell contains two diploid set. (05 Mar 2000) |
| haploidiploidy | <cell biology, genetics> Haploidiploidy is a genetic system in which one sex of the species (usually the male) is haploid (has only one set of chromosomes) and develops from eggs which have not been fertilized by sperm, and the other sex (usually the female) is diploid (has two sets of chromosomes) and develops from fertilized eggs. An example species is the honeybee. (09 Oct 1997) |
| haploidisation | <cell biology, genetics> Haploidisation is the process of creating a haploid cell from a diploid cell by progressively losing chromosomes through nondisjunction (they fail to separate equally into the daughter cells during mitosis). (09 Oct 1997) |
| haploidy | The number of chromosomes in the gametes, which is half the number normally found in somatic cells. Symbol: n. (12 Dec 1998) |
| haplology | The omission of syllables because of excessive speed of utterance. Origin: haplo-+ G. Logos, study (05 Mar 2000) |