IPA: /ˈspɪtər/
KK: /ˈspɪtər/
A person or thing that spits, often used in contexts like baseball or to describe someone who expresses anger or contempt verbally.
The pitcher threw a spitter to confuse the batter.
Spitter is formed from "spit" (from Old English "spittan", meaning to eject saliva or liquid) and "-er" (meaning a person who). The word "spitter" refers to a person or thing that spits.
Think of someone who 'ejects' ('spit') something — the '-er' just means a person. A spitter is someone who spits.