molybdenum

mo·lyb·de·num   (mə-lĭb'də-nəm)    n.   Symbol Mo A hard, silvery-white metallic element used to toughen alloy steels and soften tungsten alloy. An essential trace element in plant nutrition, it is used in fertilizers, dyes, enamels, and reagents. Atomic number 42; atomic weight 95.94; melting point 2,617°C; boiling point 4,612°C; specific gravity 10.22 (at 20°C); valence 2, 3, 4, 5, 6. See Table at element. [New Latin, from earlier molybdena, lead ore, from Latin molybdaena, galena, from Greek molubdaina, from molubdos, lead.]

molybdenum 

Main Entry: mo·lyb·de·num
Pronunciation: -d&-n&m
Function: noun
: a metallic element that resembles chromium and tungsten inmany properties, is used especially in strengthening and hardening steel, and is a trace element in plant and animal metabolism —symbol Mo; —see ELEMENT table

molybdenum mo·lyb·de·num (mə-lĭb'də-nəm)
n.
Symbol Mo
A hard metallic element that is an essential trace element in plant and animal nutrition. Atomic number 42; atomic weight 95.94; melting point 2,623°C; boiling point 4,639°C; specific gravity 10.22 (at 20°C); valence 2, 3, 4, 5, 6.