We found one dictionary that defines the word flatdweller:

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1. flatdweller: Wiktionary

Definitions from Wiktionary (flatdweller) ▸ noun:  One who lives in a flat. ▸ Words similar to flatdweller ▸ Usage examples for flatdweller ▸ Idioms related to flatdweller ▸ Wikipedia articles (New!) ▸ Popular adjectives describing flatdweller ▸ Words that often appear near flatdweller ▸ Rhymes of flatdweller ▸ Invented words related to flatdweller