- dourStern, harsh and forbidding.
- dureTo last, continue, endure.
- durainA type of coal.
- durene1,2,4,5-tetramethylbenzene, an aromatic hydrocarbon used as a solvent and in the manufacture of pyromellitic acid.
- duricrustA thin hard layer found near the surface in soil.
- durophagyThe eating of hard-shelled foods such as bones or nuts, or prey organisms such as shellfish.
- duroushard
- durum wheatTriticum turgidum subsp. durum, syn. Triticum durum (hard wheat), the flour of which is used to make pasta and bread.