Pronunciation: (si'trun),[key] —n. 1. a pale-yellow fruit resembling the lemon but larger and with thicker rind, borne by a small tree or large bush, Citrus medica, allied to the lemon and lime.
2. the tree itself.
3. the rind of the fruit, candied and preserved.
4. a grayish-green yellow color.
5. See citron melon.