No luck so far in finding etymology of "caprimulgicae".
I looked at "mulct" but it is not the root.
mulct 7mulkt8
vt.
5L mulctare < mulcta, multa, a fine6
1 to punish by a fine or by depriving of something
2 to extract (money, etc.) from (someone), as by fraud or deceit
n.
a fine or similar penalty

I looked at "promulgate, but it is not the same root:
promulgate 7pr9m4!l gat#, prb mul4gat#8
vt.
3gat#ed, 3gat#ing 5< L promulgatus, pp. of promulgare, to publish< ?6
1 to publish or make known officially (a decree, church dogma, etc.)
2 a) to make known the terms of (a new or proposed law or statute) b) to put (a law) into effect by publishing its terms
3 to make widespread !to promulgate learning and culture"
prom#ul[ga4tion
n.
prom4ul[ga4tor
n.