13-letter words containing c, a, t, h, o, d
- unchlorinated — not chlorinated; not treated with chlorine
- velocity head — the velocity of a fluid expressed in terms of the head or static pressure required to produce that velocity. It equals ρν/2 where ρ is the density of the fluid and ν is the velocity. In hydrology the density of water can be written 1/G where G is the gravitational constant
- weathercocked — Simple past tense and past participle of weathercock.
- wood hyacinth — bluebell (def 2).