Real Dictionary

calcium
a broad strait connecting two areas of sea [...]
a malleable silvery-white metallic element of the alkaline earth group; the fifth most abundant element in the earth's crust (3.6 per cent), occurring esp as forms of calcium carbonate. It is an essential constituent of bones and teeth and is used as a de
the act of freeing or state of being freed, as from captivity, imprisonment, duty, pain, life, etc [...]
the arrival or entry of many people or things [...]
the maintenance of metabolic equilibrium within an animal by a tendency to compensate for disrupting changes [...]
the process of forming or obtaining images by electronically tracing something such as sound waves, temperature, or chemicals, rather than by using light rays or ordinary photography [...]
uncountable noun: Calcium is a soft white element which is found in bones and teeth, and also in limestone, chalk, and marble.