noun

• (often attributive) A pruned tree; the wood of such trees.
  "The enclosure was indeed little beyond that of a good-sized paddock – its boundaries were visible on every side – but swelling uplands, covered with massy foliage sloped down to its wild irregular turf soil – soil poor for pasturage, but pleasant to the eye; with dell and dingle, bosks of fantastic pollards – dotted oaks of vast growth – here and there a weird hollow thorn-tree – patches of fern and gorse."
• (obsolete, rare) A European chub (Squalius cephalus, syn. Leuciscus cephalus), a kind of fish.
• (now Australia) A fine grade of bran including some flour. The fine cell layer between bran layers and endosperm, used for animal feed.
• (numismatics, historical) A 13th-century European coin minted as a debased counterfeit of the sterling silver penny of Edward I of England, at first legally accepted as a halfpenny and then outlawed.

verb

• (horticulture) To prune a tree heavily, cutting branches back to the trunk, so that it produces dense new growth.
  "I didn't know one could pollard elms. I thought one only pollarded willows."