past participle of ISS
n a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks)
n the smallest whole number or a numeral representing this number
n the 9th letter of the Roman alphabet
(ISS 的过去分词) [化] 离子散射能谱; 离子散射能谱学