What is "water torch"

Water torch \Wa"ter torch`\ (Bot.) The common cat-tail ( Typha latifolia), the spike of which makes a good torch soaked in oil.
--Dr. Prior.

Water torch can mean:

• Water torch, an oxyhydrogen torch whose gas supply is generated immediately by electrolysis of water
• The water plant Typha latifolia, because its stems when soaked in oil make good burning torches