Términos

The activity or sport of riding a bicycle or any cycle.

A wax-like volatile cyclic alkane used as a consolidant for various materials; and as a temporary fixative for water-sensitive media on paper.

An oily liquid ketone used as an industrial solvent for paints, coatings and plastics. It is also used to clean metals, remove spots in fabrics, and as an activator in oxidation reactions.

A vapor phase inhibitor used in steam generation and distribution systems required for heating or humidification to protect the ferrous components of these systems from corrosion.

One of two families containing anteaters.

Order of comb jellies, distinguished by having spherical or oval bodies and branched, retractable tentacles.

Members of the genus containing several living species and at least 10 extinct species of large waterfowl characterized by long-necks, heavy-bodies, large feet, graceful swimming style, and flying with slow wingbeats and with necks outstretched. Many swans are white. Swans are revered in many religions and cultures, especially Hinduism. They are common symbols in art around the world.

Standard tall lykythoi of cylindrical shape, typically white-ground, and used primarily in funerary rituals, which is known from their excavation from cemeteries and the subjects depicted on them. Late in the fifth century some massive examples of the shape were produced, serving perhaps as equivalents for stone grave markers.

Outline or form delimited by two ends that are equal and parallel circles, and the intervening curved surface is such as would be traced out by a straight line moving parallel to itself with its ends in the circumferences of these circles.

In wooden barrel-making, bung borers designed to allow the boring of the bunghole and tap hole in one step, rather than the two-step process of a drilling pilot hole and then enlarging the pilot hole to the correct size with a tapered reamer.

Drafting and drawing instruments for copying or tracing the contour of solid objects, such as sculpture profiles and moldings; invented in 1841 by Robert Willis, Cambridge University.

Family containing two genera and two species of flying lemurs, which are nocturnal, arboreal gliding mammals found in South-east Asia. They are about the size of a domestic cat and characterized by lateral skin membranes extending from the forelimbs to the tail, by means of which they make long gliding leaps from tree to tree. Although flying lemurs share some characteristics with certain bats (flying foxes), they are most closely related to the primates.

Genus containing one living species of flying lemur.

Members of a genus containing five species of gregarious, colony-forming rodents that live in extensive burrow systems in grasslands of plains, high plateaus, and montain valleys in North America, and have a call resembling a dog's bark.

Family containing around 110 genera and 5,500 species of plants, many growing in wetlands; they superficially resemble grasses or rushes by stems that are triangular in cross-sections and having leaves that are spirally arranged in three ranks (while grasses have alternate leaves forming two ranks).

Genus containing around 650 species of annual or perennial plants distributed throughout all continents, often in wetlands. The stems are circular or triangular in cross-section, usually leafless for most of their length with the slender grass-like leaves at the base of the plant.

Species of tall, robust, leafless aquatic plant growing to 5 m (16 feet) in height, forming a grass-like clump of green stems, triangular in cross section, that rise up from thick, woody rhizomes. Each stem is topped by a dense cluster of thin, bright green stems. It is edible to humans. It was cultivated in ancient Egypt, collected for its stalk or stem, the central pith of which was cut into thin strips, assembled in layers at right angles, pressed together, and dried to form a smooth, thin writing surface as early as the 3rd millennium BCE. Its use spread to the Greeks and then to the Roman Empire. Papyrus can darken and discolor with age. Other products were boats, sails, and cords. The species is now almost extinct in Egypt, but still of importance elsewhere in Africa as a fuel source. It is cultivated throughout the tropics; popular as an ornamental in Europe, Asia, and North America.