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Herbaceous Plants: group of plant families not belonging either to the Graminaceae nor to trees and whose stem is soft, generally green and little resistant
Heredity: transmission of genetic characteristics by the parents to their offspring.
Histamine: the compound which comes from the conversion of the amino acid (a component of proteins) hisdidine. It plays the role of a chemical messenger in several mechanisms, including the triggering of an allergic reaction. It is the first mediator of allergy to be demonstrated. Research on histamine led to the discovery of antihistaminic drugs.
HLA (system - Human Leukocyte Antigens):
synonym for Human Major Histocompatibility
Complex (MHC).
Hydrotherapy: the use of the therapeutic properties of natural mineral waters. The composition of a mineral water directs its use in therapy.
Hymenoptera: order of insects characterized by four transparent membranous wings, for example bees, wasps, ants.
Hyperreactivity (nasal or bronchial): increased and excessive nasal or bronchial reaction against inhaled non specific provocating agents (e.g. tobacco, temperature variation, etc.).
Hyposensitization: synonym for "de-sensitization".
Hyposmia: partial loss of smell.