16-letter words containing d, u, a, t, h, l
- thousand islands — a group of about 1500 islands between the US and Canada, in the upper St Lawrence River: administratively divided between the two countries
- twofold purchase — a purchase using a double standing block and a double running block so as to give a mechanical advantage of four or five, neglecting friction, depending on whether the hauling is on the standing block or the running block.
- typhoid bacillus — the bacterium Salmonella typhosa, causing typhoid fever.
- underpitch vault — a construction having a central vault intersected by vaults of lower pitch.