Longman Dictionary of Contemporary English
Wiktionary
n. 1 The white seed head of a dandelion after flowering. 2 A children's amusement in which the number of puffs needed to blow the filamentous achenes from a dandelion is supposed to tell the time.
Usage examples of "dandelion clock".
The oldest cousin, Uncle Mark's daughter Esther, held her little brother Richard on her lap and tickled him secretly with a dandelion clock.
Silence would have been a terrible din compared to the sudden soft implosion of noiselessness that hit the wizards with the force of an exploding dandelion clock.
It was as silent as a dandelion clock striking midnight, but it had pressure.
Sticking in the man's foot was the land version of the sea urchin: a small green disc with spines radiating from it, like a flattened dandelion clock.
She had also tried a spell on her hair, but it was naturally magic-resistant and already the natural shape was beginning to assert itself (a dandelion clock at about 2pm).
His cloud of white hair made him look rather like an aged dandelion clock and was topped by a moth-eaten fez.
Her platinum hair was as buoyant as a great dandelion clock- She wore a vest and short kilt of snow-while chamois and there were white buskins on her tiny feet.