With this suffix in Spanish we have a problem. It turns out that it went through Latin, but it comes from Greek, and in our language created a false cut because the first /o/ does not belong to the original voice but is a vowel to combine with other words, when it does not belong smoothly and plainly to the previous word. Actually the suffix should be -stomy , 963; 964; 959; 956; 945; ( stoma "cut, mouth" ) or the most simplified -tomía that comes from the suffix - 964; 959; 956; 959; 962; (we take "cutting" ). The latter also has a widely used form that is -ectomy, 949; 954; 964; 959; 956; 951; ( I ectome "cutting, removing" ). But still, '-ostomy' can also have its etymology if we think of 959; 963; 964; 949; 959; 957; ( osteon "bone" ) and suffixes - 953; 945; o - 949; 953; 945; ( -ía for "illness, ailment" ).
