LOL...you had to dig deep to find this ...this is the use of the word "sacred" as it would refer to a priest...THIS IS NOT A DEFINITION OF PRIEST.. There is no definition given for priest
You asked for the definition of sacerd. Here and here is the definition of preost:
preóst es; m.A priest
1. an ecclesiastic of the seventh of the holy orders; the bishop and the priest were of the same order, but the bishop's functions were more extensive, and in this respect he was superior to the priest. Cf. Ll. Th. ii. 348, 20-29
2. in a more general sense a member of the ecclesiastical profession
3. where preóst is in contrast with munuc
4. where preóst is in contrast with sácerd
[O. L. Ger. préstar : O. Frs. préstere : O. H. Ger. priestar, préstar: Icel. prestr. Front Latin presbyter.]