| Term | Definition / Meaning / Stand for |
| HMB |
3-Hydroxy-3-Methylbutyrate |
| HES |
Hairy and Enhancer of Split |
| HP |
Haptoglobin |
| HW |
Hardy-Weinberg Equilibrium |
| HRAS |
Harvey Rat Sarcoma Viral Oncogene |
| HSE |
Heat Shock Element |
| HCDR |
Heavy Chain Complementarity-Determining Region |
| HLC |
Heavy Light Chain |
| HML |
Heavy Metal-Like |
| Hh |
Hedgehog Signaling Pathway |
| HA |
Hemagglutinin |
| HEC |
Hematopoietic Endothelial Cell |
| HIN |
Hematopoietic Interferon Network |
| HLS |
Hematopoietic Lineage-Specific |
| HST |
Hematopoietic Stem and Progenitor Cells |
| HMOX |
Heme Oxygenase Gene |
| HO |
Heme Oxygenase |
| HEM |
Heme Oxygenase |
| HFE |
Hemochromatosis Protein |
| HBA |
Hemoglobin Alpha |
| HBB |
Hemoglobin Beta |
| HBD |
Hemoglobin Delta |
| HBG |
Hemoglobin Gamma |
| HB |
Hemoglobin |
| HS |
Heparan Sulfate |
| HIP |
Hepatic Insulin Processing |
| HBC |
Hepatitis B Core Antigen |
| HBeAg |
Hepatitis B e Antigen |
| HGS |
Hepatocyte Growth Stimulation |
| HDD |
Hereditary Diffuse Dystrophy |
| HZ |
Heterozygote |
| HET |
Heterozygous |
| HXK |
Hexokinase Gene |
| HK |
Hexokinase |
| HMP |
Hexose Monophosphate Pathway |
| HMG |
High-Mobility Group Protein |
| HDC |
Histidine Decarboxylase |
| HY |
Histocompatibility Y Antigen |
| HDA |
Histone Deacetylase |
| HNS |
Histone Nucleosome Stabilization |
| HL |
Hodgkin's Lymphoma |
| HCS |
Holocrine Secretion System |
| HR |
Homologous Recombination |
| HOM |
Homozygous |
| HCP |
Host Cell Protein |
| HDF |
Human Dermal Fibroblast |
| HFF |
Human Foreskin Fibroblast |
| HHV |
Human Herpesvirus |
| HXB |
Hybridization Box |
| HPB |
Hydroperoxide-Binding |
| HBR |
Hydrophobic Binding Region |
| HADH |
Hydroxyacyl-Coenzyme A Dehydrogenase |
| HAP |
Hydroxyapatite |
| HDO |
Hydroxylation-Dependent Oxidation |
| HSD |
Hydroxysteroid Dehydrogenase |
| HU |
Hydroxyurea |
| HT |
Hyperthermia |
| HPA |
Hypothalamic-Pituitary-Adrenal Axis |
| HGPRT |
Hypoxanthine-Guanine Phosphoribosyltransferase |
| HRE |
Hypoxia-Responsive Element |
| HBPS |
2'-hydroxybiphenyl-2-sulfinate |
| HDMI |
2-hydroxydesipramine |
| HMGCL |
3-hydroxy-3-methylglutaryl-CoA Lyase |
| HAD |
3-hydroxyacyl-CoA Dehydrogenase |
| HCDH |
3-hydroxyacyl-CoA-dehydrogenase |
| HDMB |
4-hydroxy-3,5-dimethoxybenzaldehyde |
| HAF |
5-hexadecanoylaminofluorescein |
| HOQ |
8-hydroxylquinoline |
| HDX |
Acid-beta-hydroxamate |
| HOAD |
Beta-hydroxyacyl-CoA Dehydrogenase |