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t directly perceptible, but detected only by means of specially constructed apparatus. -- Mi`cro*seis"mic (#), *seis"mic*al (#), a.

A microseismometer; specif., a microseismometer producing a graphic record.

Science or study of microseisms.

A seismometer for measuring amplitudes or periods, or both, of microseisms. --Mi`cro*seis*mom"e*try (#), n.

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

A spectroscope arranged for attachment to a microscope, for observation of the spectrum of light from minute portions of any substance.

A sporangium or conceptacle containing only very minute spores. Cf. Macrosporangium.

One of the exceedingly minute spores found in certain flowerless plants, as Selaginella and Isoetes, which bear two kinds of spores, one very much smaller than the other. Cf. Macrospore.

Of or pertaining to microspores.

One of a group of mammals having a small size as a typical characteristic. It includes the lower orders, as the Insectivora, Cheiroptera, Rodentia, and Edentata.

Having a typically small size; of or pertaining to the microsthenes.

A tasimeter, especially when arranged for measuring very small extensions. See Tasimeter.

An instrument for making very thin sections for microscopical examination.

Of or pert. to the microtome or microtomy; cutting thin slices.

One who is skilled in or practices microtomy.

The art of using the microtome; investigation carried on with the microtome.

A measure of electro-motive force; the millionth part of one volt.

The millionth part of one weber.

The Infusoria.

A small motile spore furnished with two vibratile cilia, found in certain green algæ.