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A large sting ray of the genus Trygon, especially T. sephen of the Indian Ocean and the Red Sea. The skin is an article of commerce.

ing with a sheath; as, the sheathing leaves of grasses; the sheathing stipules of many polygonaceous plants.

An acrid plant of the genus Polygonum (P. Hydropiper), which produces smarting if applied where the skin is tender.

A kind of knotweed (Polygonum Bistorta).

-- Sol`o*mon"ic, a. Solomon's seal (Bot.), a perennial liliaceous plant of the genus Polygonatum, having simple erect or curving stems rising from thick and knotted rootstocks, and with white or greenish nodding flowers. The commonest European species is Polygonatum multiflorum. P. biflorum and P. giganteum are commo…

id angle of the surface of any sphere whose center is the angular point. -- Spherical polygon,portion of the surface of a sphere bounded by the arcs of three or more great circles. -- Spherical projection, the projection of the circles of the sphere upon a plane. See Projection. -- Spherical sector. See under Sector…

oboid spore, esp. one of those produced by division of the passive spores into which the zygote divides. The sporozoites reproduce asexually.

Any one of numerous rays of the family Dasyatidæ, syn. Trygonidæ, having one or more large sharp barbed dorsal spines, on the whiplike tail, capable of inflicting severe wounds. Some species reach a large size, and some, esp., on the American Pacific coast, are very destructive to oysters.

ung, pig. See Hog. "A great herd of swine." Mark v. 11. Swine grass (Bot.), knotgrass (Polygonum aviculare); -- so called because eaten by swine. -- Swine oat (Bot.), a kind of oat sometimes grown for swine. -- Swine's cress (Bot.), a species of cress of the genus Senebiera (S. Coronopus). -- Swine's head, a dolt; a…

A name given to several species of plants of the genus Polygonum, having angular stems beset with minute reflexed prickles.

The space, on either side of the head, back of the eye and forehead, above the zygomatic arch and in front of the ear.

sists of an expanded squamosal portion above the ear, corresponding to the squamosal and zygoma of the lower vertebrates, and a thickened basal petrosal and mastoid portion, corresponding to the periotic and tympanic bones of the lower vertebrates.

, a bastion of masonry, often with chambers beneath, built at an angle of the interior polygon of some works. -- Tower mustard (Bot.), the cruciferous plant Arabis perfoliata. -- Tower of London, a collection of buildings in the eastern part of London, formerly containing a state prison, and now used as an arsenal an…

A very handsome American butterfly (Polygonia interrogationis). Its wings are mottled with various shades of red and brown and have violet tips.

The pygostyle.

A large sting ray (Dasybatis, or Trygon, Sayi) native of the Southern United States. It is destitute of large spines on the body and tail.

A kind of Solomon's seal (Polygonum officinale).

Any kind of Polygonum with willowlike foliage.

Same as Zygobranchia.

See under Zygosphene.