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A kind of helmet worn in the 14th, 15th, and 16th centuries.

Arithmetic. [Obs.] Chaucer.

The investigation of the relation between the sun, moon, and stars, and the weather. -- As`*tro*me`te*or`o*log"ic*al, a. -- As`tro*me`te*or*ol"o*gist, n.

An instrument for comparing the relative amount of the light of stars.

The art of making measurements among the stars, or of determining their relative magnitudes.

A photometer for measuring the brightness of stars.

ation of the brightness of stars, and also of the sun, moon, and planets. --As`tro*pho`to*met"ric*al (#), a.

Incommensurable; also, unsymmetrical. [Obs.] D. H. More.

Not symmetrical; wanting proportion; esp., not bilaterally symmetrical. Huxley.

Asymmetrical. [Obs.] Barrow.

Want of symmetry, or proportion between the parts of a thing, esp. want of bilateral symmetry.

An instrument for measuring the evaporation from water, ice, or snow. Brande & C.

An instrument for measuring the rate of evaporation from a moist surface; an evaporometer. Huxley.

An instrument by which the power of hearing can be gauged and recorded on a scale.

An instrument to measure the growth of plants. Goodale.

An instrument for measuring the magnifying power of a lens or system of lenses.

An apparatus for measuring or determining the proportion of nitrogen; a nitrometer.

A soft white alloy of variable composition (as a nine parts of tin to one of copper, or of fifty parts of tin to five of antimony and one of copper) used in bearings to diminish friction.

Measurement of distance or altitude by a staff or staffs.

An idol or symbolical figure which the Templars were accused of using in their mysterious rites.