A person or thing that reaches or touches the bottom; something that serves as a bottom or foundation.
From 'bottom' + -er agent suffix. The -er suffix creates nouns meaning 'one who does' or 'that which performs' the action, making 'bottomer' mean 'one who bottoms."
Agent nouns with -er are incredibly productive in English—you can almost attach -er to any verb and create a new word that native speakers instantly understand. It's how English stays flexible!
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