La·dy's tra·ces La·dies' tress·es n. Bot. A name given to several species of the orchidaceous genus Spiranthes, in which the white flowers are set in spirals about a slender axis and remotely resemble braided hair.
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  ladies' tresses
       n : an orchid of the genus Spiranthes having slender often
           twisted spikes of white flowers [syn: lady's tresses]