Periphrasis, n.; pl. Periphrases.
Etymology: [L.]
See Periphrase.
Shades of meaning
Fernald has no entry of its own for periphrasis; he lists it under circumlocution.
Where he writes about it:
Circumlocution and periphrasis are roundabout ways of expressing thought; circumlocution is the more common, periphrasis the more technical word. — from circumlocution
Constant circumlocution produces an affected and heavy style; occasionally, skilful periphrasis conduces both to beauty and to simplicity. — from circumlocution