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Of or pertaining to photometry, or to a photometer.

One engaged in the scientific measurement of light.

A specialist in photometry.

That branch of science which treats of the measurement of the intensity of light.

A photomechanical process similar to collotype.

Any bat of the genus Phyllostoma, or allied genera, having large membranes around the mouth and nose; a nose-leaf bat.

An organic element of a flowering plant; a phyton.

One of the Plagiostomi.

See Planimeter.

An instrument for measuring the amount of force exerted by the lungs in respiration.

See Spirometry.

Having many mouths.

The second segment of one of the Gregarinæ.

A finer form of metals, indicated by enhanced lines in their spark spectra (which are also observed in the spectra of some stars), obtained at the highest available laboratory temperatures (Lockyer); as protocalcium, protochromium, protocopper, protonickel, protosilicon, protostrontium, prototitanium, protovanadium. --…

A dissecting instrument for opening the spinal canal. [Written also rachiotome.]

A contrivance for exhibiting and measuring the refraction of light.

An instrument which periodically or otherwise interrupts an electric current. Wheatstone.

One of the Rhizostomata.

One of the bony, cartilaginous, or membranous partitoins which separate the myotomes. -- Scler`o*tom"ic, a.

An instrument or apparatus for comparing and grading the sensitiveness of plates, films, etc., as a screen divided into squares of different shades or colors, from which a picture is made on the plate to be tested.