hh

1. abbreviationpluralplural onlyAbbreviation of hands (one hand being four inches).

   For a 15.2hh–16.2hh horse the average stride length is 3.6m (12ft).

   2007, Lesley Bayley, The Photographic Guide to Schooling Your Horse, David & Charles, →ISBN, page 127

1. InternetuncommonSynonym of hhh (“a sigh; laughter”).

   Synonyms: hhh

1. NazismabbreviationinitialismInitialism of Heil Hitler.

1. NazismUsed to indicate one's support for Nazism.

1. abbreviationinitialismInitialism of Her Highness.
2. abbreviationinitialismInitialism of His Highness.
3. abbreviationinitialismInitialism of His Holiness.

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

   Let's meet in HH tomorrow.

   Synonyms: HB

plural HHs

1. abbreviationinitialismaeronauticsInitialism of heavy helicopter.
2. abbreviationinitialismInitialism of household.

1. abbreviationinitialismnot comparablehobbiesInitialism of heavily hinged.

1. A protein expressed in the larva of the fruit fly Drosophila melanogaster, required for the proper development of the larval body.
   1. biologyThe gene coding for the Hh (Hedgehog) protein.
   2. biologyThe signaling pathway involving the Hh (Hedgehog) protein, and its homologues in other animals.

1. medicineA blood group system involving the presence of either the H or the h antigen on the surface of a person's red blood cells.