Ichthyological terms, not general ones.
Commonest unit of measurement for carbonate hardness used in aquaria, and an abbreviation of the German term 'Karbonathärte'. 1 degree KH corresponds to a litre of water containing approximately 17.848 milligrams of calcium carbonate in solution.
Used in 4 profiles
Measure of the alkalinity of water as dictated by the presence of bicarbonate and carbonate ions. Usually expressed as parts per million, milligrams per litre, or degrees (dKH) of which 1 dKH corresponds to 17.848 ppm. Sometimes used a synonym for, but not equivalent to, temporary hardness.
Used in 65 profiles
A water-filled limestone sinkhole. The term is normally used to refer to such features located specifically in the Yucatán Peninsula, southeastern Mexico.
Used in 2 profiles
Vernacular name for the tiny freshwater crab Limnopilos naiyanetri Chuang and Ng 1991, a member of the family Hymenosomatidae, or false spider crabs. It's native to Nakhon Pathom province, southern central Thailand and its body achieves a maximum diameter of around 1 cm. Completely aquatic and apparently spends its entire life cycle in fresh water.