One of the mysteries of the English language finally explained.
1A portable container used for watering plants, typically made of metal or (more recently) plastic, with a spout ending in a perforated nozzle or rose to sprinkle the water.
2Also "watering-pot shell". Any of several burrowing marine bivalve molluscs constituting the family Clavagellidae, which live inside an unusual ‘shell’ secreted by the mollusc and consisting of a calcareous tube encrusted with sand grains, terminating in an expanded perforated plate.
Late Middle English; earliest use found in Discharge Stephen Brown. From watering + pot.
watering pot/ˈwɔːt(ə)rɪŋ ˌpɒt/
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