I know that the answer to the question "What is the general characteristic of the s when it occurs in the beginning of a word?" is in "They are unaspirated for almost all speakers when immediately following word-initial s, as in spill, still, skill. After an s elsewhere in a word they are normally unaspirated as well, except sometimes in compound words. When the consonants in a cluster like st are analyzed as belonging to different morphemes (heteromorphemic) the stop is aspirated, but when they are analyzed as belonging to one morpheme the stop is unaspirated.[citation needed] For instance, distend has unaspirated [t] since it is not analyzed as two morphemes, but distaste has an aspirated middle [t] because it is analyzed as dis- + taste and the word taste has an aspirated initial t.". Can you tell me what it is?
unaspirated