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
a statement that is assumed to be true and from which a conclusion can be drawn; "on the assumption that he has been injured we can infer that he will not to play"
take something as preexisting and given
set forth beforehand, often as an explanation; "He premised these remarks so that his readers might understand"
a piece of information about circumstances that exist or events that have occurred; "first you must collect all the facts of the case"
a concept whose truth can be proved; "scientific hypotheses are not facts"
a statement or assertion of verified information about something that is the case or has happened; "he supported his argument with an impressive array of facts"
an event known to have happened or something known to have existed; "your fears have no basis in fact"; "how much of the story is fact and how much fiction is hard to tell"