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pėr|thy'e|r adj (i) 1 folded, pleated; bent at the joint 2 (of terrain) rugged, hilly, mountainous

pėr|thy'e|r|je nf ger 1 < pėrthy'e·n, pėrthy'·het [Phys] 2 refraction

pėr|thy'e|s
III§ adj (Phys) refractive, refracting
IV§ nm (Phys) refractor