| HUMOURLESSLY | • humourlessly adv. Alternative spelling of humorlessly. • HUMOURLESS adv. without humour, also HUMORLESS. |
| HYDROSULPHUROUS | • HYDROSULPHUROUS adj. as in hydrosulphurous acid. |
| HYPOSULPHUROUS | • hyposulphurous adj. Alternative form of hyposulfurous. • HYPOSULPHUROUS adj. of or derived from hyposulphurous acid. |
| 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. |
| ICHTHYOSAURUSES | • ICHTHYOSAURUS n. a large fossil marine reptile, also ICHTHYOSAUR, ICHTHYOSAURIAN. |
| POSTHUMOUSLY | • posthumously adv. After death. • post-humously adv. Alternative spelling of posthumously. • POSTHUMOUS adv. taking place after death. |
| SCEUOPHYLACIUMS | • SCEUOPHYLACIUM n. a sacristy. |
| SLAUGHTEROUSLY | • slaughterously adv. In a slaughterous fashion. • SLAUGHTEROUS adv. of or relating to slaughter. |
| SULPHONYLUREAS | • sulphonylureas n. Plural of sulphonylurea. • SULPHONYLUREA n. a synthetic compound used to reduce the level of glucose in the blood in diabetes mellitus. |
| SULPHUREOUSLY | • sulphureously adv. Archaic form of sulfurously. • SULPHUREOUS adv. pertaining to or like sulphur, also SULFUREOUS. |
| SULPHUROUSLY | • sulphurously adv. Alternative spelling of sulfurously. • SULPHUROUS adv. containing sulphur in lower valency; pertaining to hellfire, also SULFUROUS. |
| THYSANUROUS | • thysanurous adj. (Zoology) Of or pertaining to the Thysanura (now Zygentoma), an order of insects with three long caudal filaments. • THYSANUROUS adj. relating to a thysanuran, a bristletail. |
| YOUTHFULNESS | • youthfulness n. The vitality characteristic of youth. • YOUTHFULNESS n. the state of being youthful. |
| YOUTHFULNESSES | • youthfulnesses n. Plural of youthfulness. • YOUTHFULNESS n. the state of being youthful. |