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Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz.

A body or solid contained by many sides or planes.

A low, flat vessel, resembling a barge, furnished with cranes, capstans, and other machinery, used in careening ships, raising weights, drawing piles, etc., chiefly in the Mediterranean; a lighter. Pontoon bridge, a bridge formed with pontoons. -- Pontoon train, the carriages of the pontoons, and the materials they ca…

s. Porcupine ant-eater (Zoöl.), the echidna. -- Porcupine crab (Zoöl.), a large spiny Japanese crab (Acantholithodes hystrix). -- Porcupine disease (Med.). See Ichthyosis. -- Porcupine fish (Zoöl.), any plectognath fish having the body covered with spines which become erect when the body is inflated. See Diodon, and…

under Axis. -- Principal axes of a quadric (Geom.), three lines in which the principal planes of the solid intersect two and two, as in an ellipsoid. -- Principal challenge. (Law) See under Challenge. -- Principal plane. See Plane of projection (a), under Plane. -- Principal of a quadric (Geom.), three planes each…

A form the planes of which are parallel to the vertical axis. See Form, n., 13. Achromatic prism (Opt.), a prism composed usually of two prisms of different transparent substances which have unequal dispersive powers, as two different kinds of glass, especially flint glass and crown glass, the difference of dispersive…

An American butterfly (Polygonia, or Vanessa, Progne). It is orange and black above, grayish beneath, with an L-shaped silver mark on the hind wings. Called also gray comma.

The period during which the presidency of the senate belonged to the prytanes of the section.

A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.

th American Indians, as the bloodroot and two species of Lithospermum (L. hirtum, and L. canescens); also, the pigment itself.

One of a fabulous race of dwarfs who waged war with the cranes, and were destroyed.

Manganese dioxide, a mineral of an iron-black or dark steel- gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).

a gray or grayish green color, consisting chiefly of the hydrous silicate of iron and manganese; -- so called from the odor given off before the blowpipe.

rt; rank. We lived most joyful, obtaining acquaintance with many of the city not of the meanest quality. Bacon

At right angles, as the cranks of a locomotive, which are in planes forming a right angle with each other.

t. A fit of the stone puts a kingto the rack, and makes him as miserable as it does the meanest subject. Sir W. Temple.

es. It furnishes a perfume resembling that of the civet, which is highly prized by the Javanese. Called also Malacca weasel, and lesser civet.

quest or petition of; as, to refuse a suitor. The cunning workman never doth refuse The meanest tool that he may chance to use. Herbert.

g regarded, whether favorably or otherwise; estimation; repute; note; account. A man of meanest regard amongst them, neither having wealth or power. Spenser.

The removal of an edge or an angle by one or more planes.