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
someone who climbs as a sport; especially someone who climbs mountains; "the lead climber looked strong still but his partner often slumped in his ropes"
a vine or climbing plant that readily grows up a support or over other plants
the act of starting something; "he was responsible for the beginning of negotiations"
the first part or section of something; "`It was a dark and stormy night' is a hackneyed beginning for a story"
the event consisting of the start of something; "the beginning of the war"
the place where something begins, where it springs into being; "the Italian beginning of the Renaissance"; "Jupiter was the origin of the radiation"; "Pittsburgh is the source of the Ohio River"; "communism's Russian root"
the time at which something is supposed to begin; "they got an early start"; "she knew from the get-go that he was the man for her"
the first element in a countable series; "the first of the month"
the first or highest in an ordering or series; "He wanted to be the first"
being the gear producing the lowest drive speed; "use first gear on steep hills"
ranking above all others; "was first in her class"; "the foremost figure among marine artists"; "the top graduate"
preceding all others in time or space or degree; "the first house on the right"; "the first day of spring"; "his first political race"; "her first baby"; "the first time"; "the first meetings of the new party"; "the first phase of his training"
highest in pitch or chief among parts or voices or instruments or orchestra sections; "first soprano"; "the first violin section"; "played first horn"
indicating the beginning unit in a series
before anything else; "first we must consider the garter snake"
the initial time; "when Felix first saw a garter snake"
before another in time, space, or importance; "I was here first"; "let's do this job first"