The purpose of this study was to suggest a method for improving writing skills of foreign students through elaborating word definition. We took a position that brand-new teaching methods of writing are needed for specific learning groups, especially for students who study in Korean universities because they are supposed to develop and prove writing skills in order to perform their studies successfully. First, in chapter Ⅱ, we examined the current state of teaching writing in Korean as an L2 in context of teaching tradition and made sure that practical methods of teaching writing for academic purposes are still insufficient. Next, in chapter Ⅲ, we analyzed previous research results focused on word definition and found elaborating word definition useful for improving writing skills for tertiary level students. Finally, in chapter Ⅳ, we presented a practical teaching method for writing through elaborating word definition by showing the results which 15 foreign students (from China and Japan) produced while participating in writing class. In this paper, we introduced a new method for teaching writing in Korean as an L2 related to word learning, and expect much more teaching methods of writing to be developed and presented.