18-letter words containing d, i, c, h, l
- secondary syphilis — the second stage of syphilis, characterized by eruptions of the skin and mucous membrane.
- self-comprehending — to understand the nature or meaning of; grasp with the mind; perceive: He did not comprehend the significance of the ambassador's remark.
- strathclyde region — a former local government region in W Scotland: formed in 1975 from Glasgow, Renfrewshire, Lanarkshire, Buteshire, Dunbartonshire, and parts of Argyllshire, Ayrshire, and Stirlingshire; replaced in 1996 by the council areas of Glasgow, Renfrewshire, East Renfrewshire, Inverclyde, North Lanarkshire, South Lanarkshire, Argyll and Bute, East Dunbartonshire, West Dunbartonshire, North Ayrshire, South Ayrshire, and East Ayrshire
- sulfuric anhydride — sulfur trioxide.
- the dismal science — a name for economics coined by Thomas Carlyle
- the encyclopedists — the writers of the French Encyclopedia (1751-72) edited by Diderot and d'Alembert, which contained the advanced ideas of the period
- theodore gericault — (Jean Louis André) Théodore [zhahn lwee ahn-drey tey-aw-dawr] /ʒɑ̃ lwi ɑ̃ˈdreɪ teɪ ɔˈdɔr/ (Show IPA), 1791–1824, French painter.
- thiosulphuric acid — an unstable acid known only in solutions and in the form of its salts. Formula: H2S2O3
- welland ship canal — a ship canal in S Canada, in Ontario, connecting Lakes Erie and Ontario: 8 locks. 25 miles (40 km) long.
- widemouth blindcat — any of several catfishes, as Satan eurystomus (widemouth blindcat) of Texas, that inhabit underground streams and have undeveloped eyes and unpigmented skin.
- world championship — an international competition in a particular sport or activity for people all around the world