En-rĭng′, v. t.

verbtransitive

v. t. [Prefix en and ring, q. v.] To encircle; to surround; to bind. [Obs. or poet.]

The caption describes the Muses and the Graces grouped in threes around a billowing fountain.
The Muses and the Graces, grouped in threes, Enringed a billowing fountain in the midst. Tennyson.