a part of the cell containing DNA and RNA and responsible for growth and reproduction
any histologically identifiable mass of neural cell bodies in the brain or spinal cord
the positively charged dense center of an atom
(astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
the position on a baseball team of the player who is stationed behind home plate and who catches the balls that the pitcher throws; "a catcher needs a lot of protective equipment"; "a catcher plays behind the plate"
(baseball) the person who plays the position of catcher