CaO is unslaked lime, quicklime or calcium oxide.
"An Introduction to Chemical Science"
R.P. Williams
"But they already bury them in quicklime in England," said Eddie loftily.
"Jane Cable"
George Barr McCutcheon
The walls are about twenty feet high, with three tiers of niches, in which the bodies are enclosed with quicklime.
"The Former Philippines thru Foreign Eyes"
Tomás de Comyn Fedor Jagor Rudolf Ludwig Carl Virchow Charles Wilkes