Choy-sum Definition
noun
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.
Wiktionary
Origin of Choy-sum
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From Cantonese 菜心 (coi3 sam1) (literally "vegetable heart")
From Wiktionary
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