China 
Africa 
- Hydrochlorothiazide
- Hydrocodone
- Hydrocolloid
- Hydrocolloid dressings
- Hydrocortisone
- Hydrocortisone 17-butyrate
- Hydrocortisone acetate
- Hydrocortisone butyrate
- Hydrocyanic acid
- Hydrodelineation
- Hydrodissection
- Hydrodistillation
- Hydrodynamic focusing
- Hydrodynamic theory
- Hydrofluoric acid
- Hydrofluorocarbon
- Hydrogels
- Hydrogen Potassium ATPase
- Hydrogen atom abstraction
- Hydrogen breath test
- Hydrogen bromide
- Hydrogen chloride
- Hydrogen cyanide
- Hydrogen embrittlement
- Hydrogen fluoride
- Hydrogen iodide
- Hydrogen ion concentration
- Hydrogen ions
- Hydrogen peroxide
- Hydrogen peroxide - urea
- Hydrogen potassium ATPase
- Hydrogen sulfide
- Hydrogen sulphide
- Hydrogen-deuterium exchange
- Hydrogenase
- Hydrogenated starch hydrolysates
- Hydrogenosomes
- Hydroiodic acid
- Hydrolases
- Hydrolethalus syndrome
- Hydrologic cycle
- Hydrological cycle
- Hydrolysate
- Hydrolysis
- Hydrolysis reaction
- Hydrolytic enzymes
- Hydrolyzed protein
- Hydrometer
- Hydromorphone
- Hydromyelia
- Hydronephrosis
- Hydronium
- Hydronium ions
- Hydroperoxide
- Hydroperoxyl
- Hydrophilic interaction chromatography
- Hydrophilic-lipophilic balance
- Hydrophilization
- Hydrophobic
- Hydrophobic interaction chromatography
- Hydrophobicity
- Hydrophobin
- Hydropneumothorax
- Hydrops fetalis
- Hydroquinone
- Hydrosalpinx
- Hydrostatic weighing
- Hydrotalcite
- Hydrotherapy
- Hydrothermal
- Hydrothorax
- Hydroureter
- Hydroxamic acids
- Hydroxide
- Hydroxocobalamin
- Hydroxy acids
- Hydroxyacids
- Hydroxyapatite
- Hydroxybenzotriazole
- Hydroxybupropion
- Hydroxybutyric acid
- Hydroxychloroquine
- Hydroxychloroquine sulfate
- Hydroxycitric acid
- Hydroxyethyl cellulose
- Hydroxyethyl starch
- Hydroxyflutamide
- Hydroxyl group
- Hydroxyl radicals
- Hydroxylamine
- Hydroxylase
- Hydroxylation
- Hydroxylysine
- Hydroxymethyl
- Hydroxymethylbilane
- Hydroxymethylglutaryl coa reductase
- Hydroxynorketamine
- Hydroxyprogesterone caproate
- Hydroxypropyl cellulose
- Hydroxypropyl methylcellulose
- Hydroxypropylmethylcellulose
- Hydroxypyruvate reductase
- Hydroxyquinoline
- Hydroxysteroid
- Hydroxysteroid dehydrogenase
- Hydroxysteroid dehydrogenases
- Hydroxytyrosol
- Hydroxyurea
- Hydroxyzine
- Hyfrecator
- Hygiene
- Hygiene hypothesis
- Hygromycin
- Hymen
- Hymenolepis
- Hymenolepis diminuta
- Hymenolepis nana
- Hymenotomy
- Hyoglossus
- Hyoid bone
- Hyoid suspension
- Hyoscine butylbromide
- Hyoscyamine
- Hyoscyamus niger
- Hyper IgM syndrome
- Hyper-CVAD
- Hyperactivation
- Hyperactivity
- Hyperacuity
- Hyperacusis
- Hyperaemia
- Hyperaldosteronism
- Hyperalgesia
- Hyperalimentation
- Hyperaminoacidemia
- Hyperammonemia
- Hyperandrogenism
- Hyperbaric oxygen therapy
- Hyperbilirubinemia
- Hyperbolic discounting
- Hypercalcaemia
- Hypercalcemia
- Hypercalciuria
- Hypercapnia
- Hypercementosis
- Hyperchloremia
- Hyperchloremic acidosis
- Hyperchlorhydria
- Hypercholesterolemia
- Hyperchromicity