| RANKINE | Scale of absolute temperature in Fahrenheit, named after a 19th Century Scottish engineer and physicist (7) |
| KELVIN | Scale of absolute temperature named for him |
| TELFORD | Thomas -, eighteenth - nineteenth century Scottish engineer |
| WATT | James ___, late 18th-century Scottish engineer (4) |
| FEVER | Temperature in Fahrenheit on day before beginning of Ramadan (5) |
| DETECTS | When temperature in Fahrenheit dropped, blemishes becoming spots |
| GARIBALDIS | Biscuits with a layer of currants, named after a 19th century Italian patriot (10) |
| CATTLEYA | An orchid of Central and South America named after a 19th- century English botanist (8) |
| EARLGREY | Popular blend of China tea named after a 19th-Century British prime minister (4,4) |
| STAUNTON | Standardised pattern of chess pieces, named after a 19th-century English chess master |
| FARAD | Derived SI unit of electrical capacitance, named after a 19th-century English physicist (5) |
| BEEF | And 29 Dish named after a 19th- century Russian diplomat (4,10) |
| GUPPY | Small brightly-coloured aquarium fish (Lebistes reticulatus) named after a 19th-century naturalist who studied the fish in Trinidad (5) |
| PETERSHAM | Heavy woollen overcoat named after a 19th century English officer (9) |
| DOWNSSYNDROME | Congenital disease caused by chromosomal abnormality named after a 19th-century English physician |
| GEORGETTE | Fine silk or cotton crepe fabric similar to chiffon, named after a 19th-century Parisian dressmaker (9) |
| GALLIANO | What Italian herb liqueur is named after a 19th-century war hero? (8) |
| GREY | Beverage named after a 19th century British prime minister, Earl ... |
| ALBERT | Short watch-chain named after a 19th-century prince (6) |
| LEISLER | Small black bat named after a 19th-century zoologist (7) |
