hh

noun
  1. 1

    The signaling pathway involving the Hh (Hedgehog) protein, and its homologues in other animals.

  2. 2

    The gene coding for the Hh (Hedgehog) protein.

  3. 3

    (biology) A protein expressed in the larva of the fruit fly Drosophila melanogaster, required for the proper development of the larval body.

  4. 4

    (medicine) A blood group system involving the presence of either the H or the h antigen on the surface of a person's red blood cells.

  5. 5

    Initialism of household. [Collectively, all the persons who live in a given house; a family including attendants, servants etc.; a domestic or family establishment.]

  6. 6

    Initialism of Hansestadt Hamburg, the German city of Hamburg; used on licence plates and informally in other contexts.

  7. 7

    (military, aviation) Initialism of heavy helicopter.

  8. 8

    Abbreviation of hands (one hand being four inches).

adjective
  1. 1

    (philately) Initialism of heavily hinged.