| HYPERACUSIS | • hyperacusis n. (Medicine) A heightened sensitivity to some sounds, especially extremely loud noises. • HYPERACUSIS n. an abnormally good sense of hearing. |
| HELICHRYSUMS | • helichrysums n. Plural of helichrysum. • HELICHRYSUM n. a genus of composite plants, the flowers of which keep their colour and shape when dried. |
| HYPERVISCOUS | • hyperviscous adj. Excessively viscous. |
| ICHTHYOSAURS | • ichthyosaurs n. Plural of ichthyosaur. • ICHTHYOSAUR n. a large fossil marine reptile, also ICHTHYOSAURIAN, ICHTHYOSAURUS. |
| ICHTHYOSAURUS | • ichthyosaurus n. (Archaic) Alternative form of ichthyosaur. • ichthyosaurus n. Any members of the genus Ichthyosaurus. • Ichthyosaurus prop.n. A taxonomic genus within the family Ichthyosauridae – large, extinct marine reptiles. |
| ISOCHRONOUSLY | • isochronously adv. In an isochronous manner. • ISOCHRONOUS adv. having the same duration; recurring at equal intervals. |
| SUPERPHYSICAL | • superphysical adj. Above or beyond physics; not explainable by physical laws. • SUPERPHYSICAL adj. being above or beyond the physical world or explanation on physical principles. |
| HYDROACOUSTICS | • hydroacoustics n. Any of various sciences and technologies dealing with sound transmitted through water. • HYDROACOUSTICS n. the study of sound travelling through water. |
| HYPERCONSCIOUS | • hyperconscious adj. Extremely conscious or aware. • HYPERCONSCIOUS adj. excessively conscious. |
| PSYCHONEUROSIS | • psychoneurosis n. (Dated) neurosis. • PSYCHONEUROSIS n. neurosis. |
| PSYCHOSURGICAL | • psychosurgical adj. Relating to psychosurgery. • PSYCHOSURGICAL adj. relating to psychosurgery. |
| UNSYNCHRONISED | • unsynchronised adj. Not synchronised. • UNSYNCHRONISED adj. not synchronised, also UNSYNCHRONIZED. |
| ICHTHYOSAURIANS | • ichthyosaurians n. Plural of ichthyosaurian. • ICHTHYOSAURIAN n. a large fossil marine reptile, also ICHTHYOSAUR, ICHTHYOSAURUS. |
| ICHTHYOSAURUSES | • ICHTHYOSAURUS n. a large fossil marine reptile, also ICHTHYOSAUR, ICHTHYOSAURIAN. |
| PSYCHONEUROTICS | • psychoneurotics n. Plural of psychoneurotic. • PSYCHONEUROTIC n. one suffering from a psychoneurosis. |
| PSYCHOSURGERIES | • psychosurgeries n. Plural of psychosurgery. • PSYCHOSURGERY n. cerebral surgery employed in treating psychic symptoms. |