S: (n) cinder, clinker (a fragment of incombustible matter left after a wood or coal or charcoal fire)
S: (n) clast ((geology) a constituent fragment of a clastic rock)
S: (n) ember, coal (a hot fragment of wood or coal that is left from a fire and is glowing or smoldering)
S: (n) filing (a fragment rubbed off by the use of a file)
S: (n) paring, sliver, shaving (a thin fragment or slice (especially of wood) that has been shaved from something)
S: (n) restriction fragment (the fragment of DNA that is produced by cleaving DNA with a restriction enzyme)
S: (n) scraping ((usually plural) a fragment scraped off of something and collected) "they collected blood scrapings for analysis"
S: (n) spall, spawl (a fragment broken off from the edge or face of stone or ore and having at least one thin edge) "a truck bearing a mound of blue spalls"
S: (n) spark (a small fragment of a burning substance thrown out by burning material or by friction)