Sentence:  Such swollen fibers were deeply eosinophilic , contained a few pyknotic nuclei , and showed loss of cross <WSD>striations</WSD> , obliteration of myofibrils , and prominent vacuolization . 
Meaning of the word marked with <WSD> tags:  any of a number of tiny parallel grooves such as: the scratches left by a glacier on rocks or the streaks or ridges in muscle tissue