n. Clash or collision of heads in contest.n. A small billon or copper coin of Scotland, officially known as the lion.n. The menhaden, Brevoortia tyrannus. See cut under Brevoortia.n. The California gray whale, Rhachianectes glaucus: so called by whalers because it has a habit of butting boats.n. The gray gurnard, Trigla gurnardus.n. The ruddy duck, Erismatura rubida, more fully called hard-headed dipper. Also hardtack, toughhead.n. A kind of commercial spongen. The knapweed, Centaurea nigra: so called from its resemblance to the loggerhead, a ball of iron on a long handle. See knapweed.n. An alloy of iron, tin, and arsenic remaining on the bottom, after liquation, in the process of refining tin in the reverberatory furnace. It is nearly identical in composition with the dross removed from the surface during the operation.n. Alarge, smooth, rounded stone found especially in coarse gravel.n. The name is also applied to many other fishes having hard heads: as in America to Chriodorus atherinoides of the family Hemiramphidæ, and Salmo gairdneri, a trout; in England to Myoxocephalus scorpius, a cottoid fish.n. Inthe Bahamas, a shrub of the spurge family, Phyllanthus Epiphyllanthus. Also called seaside laurel. See laurel, 3.