| ENHYDROS | • enhydros n. A geode of chalcedony containing trapped water. • ENHYDROS n. (Greek) a variety of chalcedony containing water. |
| HYDROGEL | • hydrogel n. A colloid gel in which water is the continuous phase; they have a number of medical and industrial applications. • HYDROGEL n. a gel or gelatinous precipitate in which the liquid constituent is water. |
| HYDROGEN | • hydrogen n. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794. • hydrogen n. Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature. • hydrogen n. A sample of the element/molecule. |
| HYDROIDS | • hydroids n. Plural of hydroid. • HYDROID n. a marine creature related to, or resembling, the hydra. |
| HYDROMAS | • HYDROMA n. a watery swelling over a joint, e.g. water on the knee, also HYGROMA. |
| HYDROMEL | • hydromel n. A liquor consisting of honey diluted in water; mead prior to fermentation. • HYDROMEL n. a drink made with honey, water, herbs and spices. |
| HYDRONIC | • hydronic adj. Being or relating to a heating system that involves circulating hot water or steam. • HYDRONIC adj. pertaining to heating and cooling by water. |
| HYDROPIC | • hydropic adj. Dropsical; pertaining to or suffering from dropsy (edema). • hydropic adj. (Obsolete) Insatiably thirsty (like someone with dropsy). • hydropic adj. Swollen with water; characterized by swelling and accumulation of fluid. |
| HYDROPSY | • hydropsy n. (Dated) Edema, dropsy. • HYDROPSY n. (archaic) dropsy, also HYDROPS. |
| HYDROSKI | • hydroski n. A ski allowing a seaplane to land on water. • HYDROSKI n. a plate attached to a seaplane to facilitate takeoff and landings. |
| HYDROSOL | • hydrosol n. A sol (colloid) in which the continuous phase (dispersing medium) is water. • HYDROSOL n. an aqueous solution of a colloid. |
| HYDROXYL | • hydroxyl n. (Chemistry) A univalent radical or functional group (–OH) in organic chemistry; present in alcohols… • HYDROXYL n. the group containing oxygen and hydrogen. |
| HYDROZOA | • hydrozoa n. A large group of marine animals, of the class Hydrozoa, whose life cycles contain a sexual and asexual stage. • Hydrozoa prop.n. A taxonomic class within the phylum Cnidaria – hydrozoas. • HYDROZOON n. any coelenterate of the class Hydrozoa, comprising organisms that are mostly marine and colonial with polyp and medusoid stages in the life cycle, also HYDROZOAN. |