oleum

noun, plural o·le·a [oh-lee-uh] /ˈoʊ li ə/ for 1, o·le·ums for 2.

1. Pharmacology. oil.
2. Chemistry. pyrosulfuric acid.

noun plural olea (ˈəʊlɪə) or oleums

1. another name for fuming sulphuric acid