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French word libellule comes from Latin libra, and later Latin libellula ((New Latin) dragonfly.)
libra (Latin)
A Roman unit of measure, equal to twelve ounces; a pound (abbreviated lb.). A level (a device for making horizontal). A pair of scales, balance.
libella (Latin)
An as (the tenth part of a denarius). Level (builder's tool).
libellula (Latin)
(New Latin) dragonfly.
libellule (French)
Dragonfly (an insect of the suborder Anisoptera).