A ladle or cup-like utensil with a long handle used for scooping and pouring liquids, or a bird (like the water ouzel) that dips into water.
From Old English 'dyppan' meaning 'to dip,' plus the agent suffix '-er' meaning 'something that does the action.' The word is straightforward: it's a tool that dips.
The Big Dipper and Little Dipper constellations are named because they look like ladles—and ancient astronomers literally saw stars and thought 'that looks like a cup on a handle!' This shows how humans find familiar kitchen tools in the night sky!
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