Abbreviation of hands (one hand being four inches).
Initialism of heavily hinged.
His Holiness.
A protein expressed in the larva of the fruit fly Drosophila melanogaster, required for the proper development of the larval body.
The gene coding for the Hh (Hedgehog) protein.
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.