in·fin·i·tes·i·mal /ˌɪnfɪnəˈtesəməl◂/ adjectiveadj SMALLextremely small 极(微)小的 SYN minuscule infinitesimal changes in temperature 气温极其微小的变化
—infinitesimally adverbadv infinitesimally small 极小的
infinitesimal• The risk of getting AIDS from a health-care worker is infinitesimal.• Even an infinitesimal change in temperature will be recorded by the equipment.