"extraction" - key terms from Wikipedia

cataract extraction
dental extraction
dilation and extraction
drag extraction
evidence extraction	and link discovery
extraction
extraction	agent
extraction	and delivery
extraction	point
extraction	process
extraction	rate
extraction	sites
intact dilation and extraction
main extraction	step
oil sands extraction
selection and extraction
shadow extraction
soil vapor extraction
solvent extraction
supercritical fluid extraction
tooth extraction
wood extraction