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Having a medium orbital index; having orbits neither broad nor narrow; between megaseme and microseme.

Having the orbital index relatively small; having the orbits broad transversely; -- opposed to Ant: megaseme.

terance. Nasal bones (Anat.), two bones of the skull, in front of the frontals. -- Nasal index (Anat.), in the skull, the ratio of the transverse the base of the aperture to the nasion, which latter distance is taken as the standard, equal to 100.

Of or pertaining to an orbit. "Orbital revolution." J. D. Forbes. Orbital index (Anat.), in the skull, the ratio of the vertical height to the transverse width of the orbit, which is taken as the standard, equal to 100.

lar, not retreating backwards above the jaws; -- opposed to Ant: prognathous. See Gnathic index, under Gnathic.

sually in the form of a watch; an oscillating weight by the motion of the body causes the index to advance a certain distance at each step.

apparatus of clockwork, and a dial plate upon which the distance traveled is shown by an index. See Odometer.

s, and basic radicals. Positive crystals (Opt.), a doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, as quartz and ice; -- opposed to negative crystal, or one in which this characteri…

s projecting beyond the upper part of the face; - - opposed to orthognathous. See Gnathic index, under Gnathic. Their countenances had the true prognathous character. Kane.

implying prohibition; forbidding; as, a prohibitory law; a prohibitory price. Prohibitory index. (R. C. Ch.) See under Index.

tronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90º, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction. Gunner's quadrant, an instrument consisting of a graduated limb, with a plum…

crystal is similarly designated when the same relation holds for the acute bisectrix. -- Index of refraction. See under Index. -- Refraction circle (Opt.), an instrument provided with a graduated circle for the measurement of refraction. -- Refraction of latitude, longitude, declination, right ascension, etc., the c…

course; pertaining to refraction; as, refractive surfaces; refractive powers. Refractive index. (Opt.) See Index of refraction, under Index. -- Absolute refractive index (Opt.), the index of refraction of a substances when the ray passes into it from a vacuum. -- Relative refractive index (of two media) (Opt.), the…

A contrivance for regulating and controlling motion, as: (a) The lever or index in a watch, which controls the effective length of the hairspring, and thus regulates the vibrations of the balance. (b) The governor of a steam engine. (c) A valve for controlling the admission of steam to the steam chest, in a locomotive.…

which things are disposed in an orderly manner, so that they can be easily found, as the index of a book, a commonplace book, or the like.

lar letters, figures, or marks than the regular proportion, as, for example, in making an index.

A point so connected by any law whatever with another point, called an index, that as the index moves in any manner in a plane the first point or stigma moves in a determinate way in the same plane.

stigmata. Stigmatic geometry, or Stigmatics, that science in which the correspondence of index and stigma (see Stigma, 7) is made use of to establish geometrical proportions.

rs to distinguish them; as, a, n, 2, in the symbols Xa, An, Y2. See Suffix, n., 2, and Subindex.

etter (Print.), a figure or letter printed above the line, as a reference to a note or an index of a power, etc; as, in x2 + yn, 2 is a superior figure, n a superior letter. Cf. Inferior figure, under Inferior.