conical is an adjective so, for example: "It had a conical shape"
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There is no meaning of conical flasks. They have uses.
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A conical flask.
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Today's dunce shall wear the conical cap for the rest of the
day.
Some volcanoes are conical in shape.
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The correct spelling is conical flask. A conical flask is a type
of flask that is used in laboratories. They have a conical body,
flat bottom, and cylindrical neck.