In geology and data science, a tool or person that creates a grid pattern; in American slang, a football player.
From 'grid' plus the agent suffix -er, meaning either 'one who grids' (technical usage) or from 'gridiron' (American football slang).
The same word 'gridder' means both a piece of analysis software and a high school football player—it's a perfect example of how English recycles words completely differently in different communities without them knowing about each other.
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