A structure made of grass or thatched with grass, or a greenhouse for growing grass.
Compound of 'grass' (Old English 'gærs') and 'house' (Old English 'hūs'). References both traditional grass-built shelters found in various cultures and horticultural structures.
Grass-built houses weren't primitive desperation—they were sophisticated engineering; sod houses on the American prairie were so well-insulated they stayed warmer in winter and cooler in summer than wood-frame houses, while being fireproof from external fires.
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