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On or at the top. Milton.

Color blindness; inability to distinguish colors; Daltonism.

A group of Pulmonifera having the eyes at the base of the tentacles, including the common pond snails.

See Catopter.

A reflecting optical glass or instrument; a mirror. [Obs.]

Of or pertaining to catoptrics; produced by reflection. Catoptric light, a light in which the rays are concentrated by reflectors into a beam visible at a distance.

That part of optics which explants the properties and phenomena of reflected light, and particularly that which is reflected from mirrors or polished bodies; --- formerly caled anacamptics.

A species of divination, which was perforned by letting down a mirror into water, for a sick person to look at his face in it. If his countenance appeared distorted and ghastly, it was an ill omen; if fresh and healthy, it was favorable.

A contractile cell or vesicle containing liquid pigment and capable of changing its form or size, thus causing changes of color in the translucent skin of such animals as possess them. They are highly developed and numerous in the cephalopods.

Of or pertaining to skin diseases, or their cure.

A vegetable parasite, infesting the skin.

A division of Cheiroptera, including the bloodsucking bats. See Vampire.

Same as Hæmatoblast.

Blood formative; -- applied to a substance in early fetal life, which breaks up gradually into blood vessels.

See Hæmatoin.

A condition characterized by a tendency to profuse and uncontrollable hemorrhage from the slightest wounds.

A gorgonian coral having a horny axis.

Same as Cælenterata.

An imitative word; an onomatopoetic word.

The formation of words in imitation of sounds; a figure of speech in which the sound of a word is imitative of the sound of the thing which the word represents; as, the buzz of bees; the hiss of a goose; the crackle of fire.