Definition from Wiktionary, the free dictionary
- The white seed head of a dandelion after flowering.
- 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.
1841 April 1, “Breakfast Table Science for Young People”, in Parley's Magazine, New York, page 112:
- Dandelion clocks! -- Pray what are they? ... by far the best clock is made by blowing the downy seed of the dandelion.