Both Uses of
amour
in
Moby Dick
-  when though, according to Genesis, the angels indeed consorted with the daughters of men, the devils also, add the uncanonical Rabbins, indulged in mundane amours.†
Chpt 49-51
 
- We saw young Leviathan amours in the deep.†
Chpt 85-87 *
 
Definitions:
- 
(1)
(amour) a usually secretive or illicit sexual relationship
 - 
(2)
(meaning too rare to warrant focus) meaning too rare to warrant focus:
"Amour" is typically seen in old literature or as the French noun for "love" as when "mon amour" means "my love".