Chemistry. any of the elements oxygen, sulfur, selenium, tellurium, and polonium, which form the VIa group in the periodic table.
any of the elements oxygen, sulphur, selenium, tellurium, or polonium, of group 6A of the periodic table
Chemistry. a binary compound consisting of a chalcogen and a more electropositive element or radical.
the art of engraving on copper or brass. noun the art of engraving on copper or brass
the presiding officer of a meeting, committee, board, etc. the administrative head of a department in a high school, college, or university. someone employed to carry or wheel a person in a chair. to act as or be chairman of (a meeting, committee, etc.). noun (pl) -men Also called chairperson, (fem) chairwoman. a person who […]