'twas /twoz, twəz/ (archaic or dialect) a contraction of it was

• rain-clouds
• raincoat
• raincoats
• rain dance
• rain dances
• raindate
• raindates
• rain-doctor
• rain-doctors
• raindrop
• raindrops
• raine
• rained
• rained off
• rainfall
• rainfalls
• rainforest
• rainforests
• rain gauge
• rain gauges
• rainier
• rainiest
• rain in
• raininess
• raininesses