dim sum (dĭm' sŏŏm', sŭm') n. A traditional Chinese cuisine in which small portions of a variety of foods, including an assortment of steamed or fried dumplings, are served in succession.
[Chinese (Cantonese) tímsam, light refreshments, equivalent to Chinese (Mandarin) din, spot, drop + Chinese (Mandarin) xīn, heart.]