pumpless

English

Etymology

pump +‎ -less

Adjective

pumpless (not comparable)

1. Without a pump.
   • 1963 September, “A decade of French electrification progress”, in Modern Railways, page 193:

     Between Paris and Lyons the substation rectifiers were multi-anode units with vacuum pumps, either water- or air-cooled (the pumpless type having come later into general use on the Continent than in Britain and being first used for main-line traction in France in 1953).

References

• “pumpless”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.