a. Bot. [f. Gr. βόστρυχ-ος curl or lock of hair + -OID + -AL.] ‘Having the form or character of a ringlet or bostryx.’ Gray Bot. Text-bk., 1880.

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1875.  A. W. Bennett, trans. Sachs’s Botany, 157. A Helicoid (bostrychoid) Dichotomy.

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