ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ noun
1. : a dark-colored mound or clump of vegetation (as a hummock of tundra or a tussock of sedge in a permafrost bog) found in far northern regions (as Alaska)
2. : a strong black chewing tobacco : negrohead
3.
a. : a hard dark-colored nodule or boulder
b. : a coral boulder broken off and thrown to the surface by wind and wave action (as on the Great Barrier reef)
4. : a large blackish smooth-shelled freshwater mussel ( Quadrula ebena ) used in button making and sometimes producing valuable pearls
5.
a.
(1) : any of various plants of the genus Rudbeckia
(2) : a ribgrass ( Plantago lanceolata )
(3) : a wild peony ( Paeonia brownii ) of the western United States
(4) : the common greenbrier ( Smilax rotundifolia ) of eastern No. America
(5) : purple coneflower
b. Australia
(1) : the spiny head of a saltwort
(2) : negrohead beech
6.
a. : a drum on a windlass
b. : bollard
7. Canada : scoter
8.
a. : a small wire nail driven into the furniture of a form on a cylinder press to produce a black mark on the feed-gauge edge of the printed sheet as a guide for trimming and folding
b.
(1) : a mark made by a niggerhead
(2) : a similar mark used as a collating mark