starter

noun

1. 1

   a culture containing yeast or bacteria that is used to start the process of fermentation or souring in making butter or cheese or dough

   to make sourdough you need a starter

2. 2

   a hand tool consisting of a rotating shaft with parallel handle

3. 3

   an electric motor for starting an engine

4. 4

   food or drink to stimulate the appetite (usually served before a meal or as the first course)

5. 5

   any new participant in some activity

6. 6

   the official who signals the beginning of a race or competition

7. 7

   a contestant in a team sport who is in the game at the beginning