21-letter words containing o, l, d, h, i
- trichloroacetaldehyde — chloral (def 1).
- until the end of time — If you say that something will happen or be true until the end of time or to the end of time, you are emphasizing that it will always happen or always be true.
- up hill and down dale — strenuously and persistently
- well-ordering theorem — the theorem of set theory that every set can be made a well-ordered set.
- wholesale price index — an indicator of price changes in the wholesale market
- wildlife photographer — someone that specializes in taking photographs of wild animals, especially in their natural habitats, and plants
- yellow-throated vireo — an olive-green vireo, Vireo flavifrons, of eastern North America, having a bright yellow throat and breast.