
1) Ancient Roman title
Found on
https://www.crosswordclues.com/clue/domesticus

Latin, meaning: domestic, civil.
Found on
http://archives.nd.edu/ddd.htm

Domesticus (Latin for belonging to the house), is found in the binomial or trinomial names of many species or subspecies of animals commonly found in or around the home. Examples include: and also : ...
Found on
http://en.wikipedia.org/wiki/Domesticus
[Roman Empire] A domesticus was a member of the protectores domestici, an elite guard unit of the Late Roman army, who served as bodyguards and staff officers to the emperor. As its name testifies, these were troops considered as belonging to the household of the emperor. After a few years` service in the corps, a domesticus would normally ...
Found on
http://en.wikipedia.org/wiki/Domesticus_(Roman_Empire)

'Household man'. late Roman imperial guard soldier.
Found on
http://www.encyclo.co.uk/local/20764

Literally, a household man, this was a Byzantine Imperial guard soldier.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

domestic, civil.
Found on
https://www.math.ubc.ca/~cass/frivs/latin/latin-dict-full.html
No exact match found.