a type of sail on a windmill consisting of a series of shutters attached at one end to a single bar or rod, with the force required to open them…
| 单词 | θ212709 | 
| 释义 | society > occupation and work > equipment > mills > 			[noun]		 > windmill > sail > type of (4)		 spring sail1835 a type of sail on a windmill consisting of a series of shutters attached at one end to a single bar or rod, with the force required to open them… spring sweep1919 = spring sail n. patent sail1924 an automatically controlled windmill sail. fan-tail1934 = fan, n.1 6c.  | 
	
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