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Borrowed from Cantonese 菜心 (coi3 sam1, literally vegetable heart). Doublet of caixin.

Noun edit

choy sum (uncountable)

  1. A Chinese vegetable, a variety of Brassica rapa parachinensis subspecies, similar to bok choy but slimmer, with smooth green leaves and pale green stems, and clusters of flowers on the tips of the inner shoots

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