| hair streams | The curved lines along which the hairs are arranged on the head and various parts of the body, especially noticeable in the foetus. Synonym: flumina pilorum. (05 Mar 2000) |
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| hair transplant | Autografts of punch biopsies of hair-bearing skin, such as occipital scalp, onto frontal scalp in male pattern alopecia. (05 Mar 2000) |
| hair whorls | A spiral arrangement of the hairs, as at the crown of the head. Synonym: vortices pilorum. (05 Mar 2000) |
| hair-salt | <chemical> A variety of native Epsom salt occurring in silky fibres. Origin: A translation of G. Haarsalz. Source: Websters Dictionary (01 Mar 1998) |
| hairbell | <botany> See Harebell. Source: Websters Dictionary (01 Mar 1998) |
| hairbird | <zoology> The chipping sparrow. Source: Websters Dictionary (01 Mar 1998) |
| hairline fracture | A fracture without separation of the fragments, the line of break being hairlike, as seen sometimes in the skull. Synonym: capillary fracture. (05 Mar 2000) |
| hairpin | The structure formed by a polynucleic acid by base-pairing between neighboring complementary sequences of a single strand of either DNA or RNA. (05 Mar 2000) |
| hairpin loop | An area where single-stranded DNA or RNA has folded back on itself and nucleotides from the two separate segments have base paired, so that the resulting structure appears as the name describes. (09 Oct 1997) |
| hairpin loops | Single-stranded DNA and RNA can fold back on itself under the proper conditions forming irregular double-helical loops. (05 Mar 2000) |
| hairtail | <zoology> Any species of marine fishes of the genus Trichiurus; especially, T. Lepterus of Europe and America. They are long and like a band, with a slender, pointed tail. Synonym: bladefish. Source: Websters Dictionary (01 Mar 1998) |
| hairworm | <zoology> A nematoid worm of the genus Gordius, resembling a hair. See Gordius. Source: Websters Dictionary (01 Mar 1998) |
| hairy | A pair rule gene of Drosophila. (18 Nov 1997) |
| hairy cell leukaemia | <haematology, oncology> A rare chronic disorder characterised by proliferation of hairy cells in reticuloendothelial organs and blood. Origin: Gr. Haima = blood (13 Nov 1997) |
| hairy cells | Medium sized leukocytes that have features of reticuloendothelial cell's and multiple cytoplasmic projections (hairs) on the cell surface, but which may be a variety of B lymphocyte; they are found in hairy cell leukaemia. (05 Mar 2000) |