Definitions

1. verb

to form or be adorned with stars, especially in the shape of a constellation

“The night sky costellated with twinkling stars.”

2. verb (archaic)

to form or be adorned with a pattern of stars

“The medieval artist costellated the celestial vault.”

3. noun

a figure or pattern resembling a constellation

“The intricate costellate design on the tapestry was breathtaking.”