Meaning of CALCIUM in English
/kal"see euhm/ , n. Chem., Biol.
a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc., occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions. Symbol: Ca; at. wt.: 40.08; at. no.: 20; sp. gr.: 1.55 at 20°C.
[ 1800-10; CALC- + -IUM ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012