pomelo

柚 is composed of the radical of 木 (wood) and 由 (reason). 木 is the pictograph of a tree, while 由 depicts oil droplets congealing into fat, with the original meaning being oil or fat, and by extension conveys the idea of plumpness and great size; thus 柚 conveys the idea of a large fruit that grows on a tree with thick skin and abundant juicy flesh, means pomelo.