Crossword clue: pertaining to or designating arc lamps so constructed that more than one can be used on a single circuit.

The most common answer is polyphotal (10 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

polyphotal 10 letters web-def

Pertaining to or designating arc lamps so constructed that more than one can be used on a single circuit.

polyphote 9 letters web-def

Pertaining to or designating arc lamps so constructed that more than one can be used on a single circuit.