1. A benign or malignant tumor derived from epithelium. ���Ե���Ƥ�����γ�ԱԱ��һ�顣
2. Lipoma is the second most common benign tumor of the colon after adenomas. ֬�����ǽ᳦�н����������ĵڶ�λ���������������
3. Thus oil and grease includes a large and diverse variety of materials, ranging from extremely toxic materials such as benzene to benign plant waxes. Ȼ�����ͺ����Ͱ��������Ҷ��ֶ����Ļ�ѧ���ʣ��Ӽ����ж��Ļ�ѧ�������磬�������º͵�ֲ�������
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adj.
1. not dangerous to health; not recurrent or progressive (especially of a tumor)
2. pleasant and beneficial in nature or influence
3. kindness of disposition or manner