a·ri·o·so 
(ä′rē-ōsō, -zō) Music
(ä′rē-ōsō, -zō) Music n. pl. a·ri·o·sos
1.
a. A style used in opera and oratorio, similar to but more melodic than recitative.
b. A passage rendered in this style.
2. A short vocal solo having the melodic style but not the form of an aria.
adv. & adj.
In a melodic style like that of an aria. Used chiefly as a direction.
[Italian, from aria, aria; see ARIA.]