| HYPERACIDITY | • hyperacidity n. The condition of being excessively acidic. • HYPERACIDITY n. the condition of containing more than the normal amount of acid.
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| HYPERACTIVITY | • hyperactivity n. The quality of being hyperactive; excessive and pathological movement and restlessness. • HYPERACTIVITY n. the state of being excessively or pathologically active.
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| HYPERCRITICALLY | • hypercritically adv. In a hypercritical manner. • HYPERCRITICAL adv. meticulously or excessively critical.
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| HYPERENDEMICITY | • hyperendemicity n. The quality of being hyperendemic. | 
| HYPERFEMININITY | • hyperfemininity n. The condition of being extremely feminine; excessive femininity. | 
| HYPERINTENSITY | • hyperintensity n. An area of high intensity (for example, as seen in magnetic resonance imaging). | 
| HYPERMOBILITY | • hypermobility n. An excess amount of elasticity in a bodily joint. • HYPERMOBILITY n. extreme mobility.
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| HYPERMUTABILITY | • hypermutability n. The state of being hypermutable. • HYPERMUTABILITY n. the state of being hypermutable.
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| HYPERPITUITARY | • HYPERPITUITARY adj. relating to increased hormone secretion by the pituitary body. | 
| HYPERREACTIVITY | • hyperreactivity n. (Uncountable) The condition of being hyperreactive. • hyperreactivity n. (Countable) An allergic response to a very low dose of irritant.
 • HYPERREACTIVITY n. the state of being hyperreactive.
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| HYPERSALINITY | • hypersalinity n. Abnormally high salinity. • HYPERSALINITY n. excessive salinity.
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| HYPERTHYROIDISM | • hyperthyroidism n. (Medicine) The excessive production of hormones by the thyroid. • hyperthyroidism n. (Pathology) The pathological condition resulting from these excess hormones.
 • HYPERTHYROIDISM n. excessive functional activity of the thyroid gland.
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| HYPERTONICITY | • hypertonicity n. The condition of being hypertonic. • HYPERTONICITY n. the condition of being hypertonic.
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| HYPERVISCOSITY | • hyperviscosity n. Increased viscosity, especially of the blood. • HYPERVISCOSITY n. extreme viscosity.
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| ICHTHYODORYLITE | • ICHTHYODORYLITE n. a fossilised fish-spine, also ICHTHYODORULITE. |