noun

• Any plant which habitually breaks away from its roots once dry, forming a light, rolling mass which is driven by the wind from place to place; as Russian thistle, wild indigo, witch grass, Amaranthus albus, etc.
• (attributive) Describing unwanted silence and inactivity. Often used of a situation when one makes a statement that is ignored or ill-received by one's audience, as the resultant silence is likened to that of a desolate desert with rolling tumbleweeds.
• A tan colour, like that of a tumbleweed.