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Identity in pitch; coincidence of sounds proceeding from an equality in the number of vibrations made in a given time by two or more sonorous bodies. Parts played or sung in octaves are also said to be in unison, or in octaves.

ystem of organs which eliminate nitrogenous waste matter from the blood of certain invertebrates.

any term or feast; the octave; as, the utas of St. Michael. Cowell. The marriage was celebrated and Canterbury, and in the utas of St. Hilary next ensuing she was crowned. Holinshed.

A receptacle, or pouch, connected with the oviducts of many invertebrates in which the eggs are retained until they hatch or until the embryos develop more or less. See Illust. of Hermaphrodite in Append.

The terminal part of the oviduct in insects and various other invertebrates. See Illust., of Spermatheca.

scular system (Zoöl.), a system of vessels in annelids, nemerteans, and many other invertebrates, containing a circulating fluid analogous to blood, but not of the same composition. In annelids the fluid which they contain is usually red, but in some it is green, in others yellow, or whitish.

The anal opening of certain invertebrates and fishes; also, the external cloacal opening of reptiles, birds, amphibians, and many fishes.

Vertebrate.

Vibrating; tremulous; resonant; as, vibrant drums. Longfellow.

An instrument to observe and record vibrations.

An instrument for observing or tracing vibrations.

Happening once in twenty years; as, a vicennial celebration.

y understood to include that part of the kinetic energy of the body which is due to the vibrations of its molecules.

en the visceral clefts. -- Visceral cavity or tube (Anat.), the ventral cavity of a vertebrate, which contains the alimentary canal, as distinguished from the dorsal, or cerebro-spinal, canal. -- Visceral clefts (Anat.), transverse clefts on the sides just back of the mouth in the vertebrate embryo, which open into t…

al in honor of the visit of the Virgin Mary to Elisabeth, mother of John the Baptist, celebrated on the second of July. The Order of the Visitation of Our Lady (R. C. Ch.), a religious community of nuns, founded at Annecy, in Savoy, in 1610, and in 1808 established in the United States. In America these nuns are devote…

An artificial division of vertebrates including those that produce their young alive; -- opposed to Ovipara.

Vocal fremitus Etym: [L. fremitus a dull roaring or murmuring] (Med.), the perceptible vibration of the chest wall, produced by the transmission of the sonorous vibrations during the act of using the voice. -- Vocal music, music made by the voice, in distinction from instrumental music; hence, music or tunes set to w…

ed to resonance in the chest, or thorax; voice of the thick register. It is produced by vibration of the vocal cords through their entire width and thickness, and with convex surfaces presented to each other. -- Head voice (Phon.), a kind of voice of high pitch and of a thin quality ascribed to resonance in the head;…

Uttered with voice; pronounced with vibrations of the vocal cords; sonant; -- said of a sound uttered with the glottis narrowed. Voiced stop, Voice stop (Phon.), a stopped consonant made with tone from the larynx while the mouth organs are closed at some point; a sonant mute, as b, d, g hard.

of the family Vorticellidæ. They have a more or less bell-shaped body with a circle of vibrating cilia around the oral disk. Most of the species have slender, contractile stems, either simple or branched.