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Quality or state of being occasional; occasional occurrence. [R.]

A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite.

Titanium dioxide occurring in acute octahedral crystals.

A colorless liquid hydrocarbon of the octylene series, occurring in Caucasian petroleum.

An occurrence supposed to portend, or show the character of, some future event; any indication or action regarded as a foreshowing; a foreboding; a presage; an augury. Bid go with evil omen, and the brand Of infamy upon my name. Milton.

) The line in a doubly refracting crystal, in the direction of which no double refraction occurs. A uniaxial crystal has one such line, a biaxial crystal has two. -- Optical circle (Opt.), a graduated circle used for the measurement of angles in optical experiments. -- Optical square, a surveyor's instrument with ref…

e others, and sometimes of a strange and unexpected appearance. About one hundred species occur in the United States, but several thousand in the tropics.

Of periods of time or occurrences, and the like. The side chambers were . . . thirty in order. Ezek. xli. 6. Bright-harnessed angels sit in order serviceable. Milton. Good order is the foundation of all good things. Burke.

A native metal or its compound with the rock in which it occurs, after it has been picked over to throw out what is worthless.

ital processes, and include many substances of artificial production which may or may not occur in animals or plants; -- contrasted with Ant: inorganic.

The footmark of a bird occurring in strata of stone. Hitchcock.

Arsenic sesquisulphide, produced artificially as an amorphous lemonyellow powder, and occurring naturally as a yellow crystalline mineral; -- formerly called auripigment. It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing. Our orpiment and sublimed mercurie. Chauce…

A variety of allanite occurring in slender prismatic crystals.

One of the protoplasmic cells which occur in the osteogenetic layer of the periosteum, and from or around which the matrix of the bone is developed; an osteoplast.

A micaceous mineral occurring in small scales. It is characteristic of certain crystalline schists.

lower end of a water course; the open end of a drain, culvert, etc., where the discharge occurs.

rate the blocks. -- To overhaul running rigging, to keep it clear, and see that no hitch occurs.

r eggs in the ovary, and the discharge of the same. In the mammalian female the discharge occurs during menstruation.

A hydrocarbon radical (C2O2) regarded as a residue of oxalic acid and occurring in derivatives of it.

A colorless, tasteless, odorless, gaseous element occurring in the free state in the atmosphere, of which it forms about 23 per cent by weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.96.