Wicking

wick  (wk)

n.

1. A cord or strand of loosely woven, twisted, or braided fibers, as on a candle or oil lamp, that draws up fuel to the flame by capillary action.

2. A piece of material that conveys liquid by capillary action.

tr. & intr.v. wicked (wkt), wick·ing, wicks

To convey or be conveyed by capillary action: water gradually wicking up through the bricks.

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[Middle English wike, from Old English woce.]