The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
sak-
DEFINITION:
To sanctify. 1. Suffixed form *sak-ro-.a.sacred, sacristan, sexton; consecrate, execrate, from Latin sacer, holy, sacred, dedicated; b. compound *sakro-dht-, “performer of sacred rites” (*-dht-, doer; see dh-). sacerdotal, from Latin sacerds, priest. 2. Nasalized form *sa-n-k-.saint, sanctum; corposant, sacrosanct, sanctify, from Latin sancre (past participle snctus), to make sacred, consecrate. (Pokorny sak- 878.)
t-, “performer of sacred rites” (*-dh
-). sacerdotal, from Latin sacerd
re (past participle s
nctus), to make sacred, consecrate. (Pokorny sak- 878.) 
