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A substance through which an effect is transmitted from one thing to another; as, air is the common medium of sound. Hence: The condition upon which any event or action occurs; necessary means of motion or action; that through or by which anything is accomplished, conveyed, or carried on; specifically, in animal magnet…

An optical apparatus in which pictures are viewed through a large lens with stereoptical effects. It is often combined with the stereoscope.

eibomius. Meibomian glands, the slender sebaceous glands of the eyelids, which discharge, through minute orifices in the edges of the lids, a fatty secretion serving to lubricate the adjacent parts.

only red light, so that objects of other colors, as green leaves, appear black when seen through it. It is used for viewing colored flames, to detect the presence of potassium, lithium, etc., by the red light which they emit.

The doctrine that there is a tendency throughout nature toward improvement. J. Sully.

n olden times as a memorial or monument. Many, of unknown date, are found in Brittany and throughout Northern Europe.

Recurring once a month; monthly; gone through in a month; as, the menstrual revolution of the moon; pertaining to monthly changes; as, the menstrual equation of the sun's place.

Being at, or pertaining to, midday; belonging to, or passing through, the highest point attained by the sun in his diurnal course. "Meridian hour." Milton. Tables ... to find the altitude meridian. Chaucer.

The point of intersection of a vertical line through the center of gravity of the fluid displaced by a floating body which is tipped through a small angle from its position of equilibrium, and the inclined line which was vertical through the center of gravity of the body when in equilibrium.

esis involves the production of sexual individuals by nonsexual means, either directly or through intervening sexless generations. Opposed to monogenesis. See Alternate generation, under Generation.

The continuation of a trope in one word through a succession of significations, or the union of two or more tropes of a different kind in one word.

on; -- especially applied to the recrystallization which sedimentary rocks have undergone through the influence of heat and pressure, after which they are called metamorphic rocks.

l and sexually developed forms, from the union of which organisms are produced which pass through the same cycle of changes. See Transformation.

A small body moving through space, or revolving about the sun, which on entering the earth's atmosphere would be deflagrated and appear as a meteor. These bodies [small, solid bodies] before they come into the air, I call meteoroids. H. A. Newton.

a gas meter in which the revolution of a chambered drum in water measures the gas passing through it.

A measure of energy or work done; the power exerted in raising one gram through the distance of one meter against gravitation.

An opening in the outer coat of a seed, through which the fecundating pollen enters the ovule. -- Mi*crop"y*lar, a.

A passage underground through which ore is shot.

chapter in the twentieth chapter of Revelation, during which holiness is to be triumphant throughout the world. Some believe that, during this period, Christ will reign on earth in person with his saints.

The act or employment of grinding or passing through a mill; the process of fulling; the process of making a raised or intented edge upon coin, etc.; the process of dressing surfaces of various shapes with rotary cutters. See Mill. High milling, milling in which grain is reduced to flour by a succession of crackings, o…