round or rounded; rotund, spherical ...1614 rare
from Latin rotundus (rotund) + -ious
FIRST DOCUMENTED USE
1614 - see EXAMPLE below
"...He's now obscur'd and now his beames out: powres
As skies are cleare, or thicke twixt vs and him.
Thus all the Aprill, ar bopeepe he plaies,
Incircling daily the Rotundious spheare.
And at the Bull he hides his glistring raies..."
From: The Nipping Or Snipping of Abuses: Or the Woolgathering of Witte
- John Taylor