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One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ.

A structure, part, or organ developed independently, that is, not derived from a similar structure, part, or organ, in a pre existing form.

A treatise on, or the science which treats of, the kidneys, and their structure and functions.

tion or disease, that is, a disease of the nerves without any appreciable change of nerve structure.

nus of marine flagellate Infusoria, remarkable for their unusually large size and complex structure, as well as for their phosphorescence. The brilliant diffuse phosphorescence of the sea is often due to myriads of Noctilucæ.

Resembling in form or structure a foraminiferous shell of the genus Nodosaria. -- n. (Zoöl.)

One who believes that past changes in the structure of the earth have proceeded from cataclysms or causes more violent than are now operating; -- called also nonuniformitarian.

Like a nut either in structure or in being indehiscent; bearing one-seeded nutlike fruits. [Written also nucumentaceous.]

One of the prehistoric towerlike structures found in Sardinia.

recognizing and noting some fact or occurrence in nature, as an aurora, a corona, or the structure of an animal.

Any structure (as a fortification) or place with eight sides or angles. Regular octagon, one in which the sides are all equal, and the angles also are all equal.

The science which treats of the teeth, their structure and development.

A special structure found in the mouth of most mollusks, except bivalves. It consists of several muscles and a cartilage which supports a chitinous radula, or lingual ribbon, armed with teeth. Also applied to the radula alone. See Radula.

over; -- applied to passageways; as, an open door, window, road, etc.; also, to inclosed structures or objects; as, open houses, boxes, baskets, bottles, etc.; also, to means of communication or approach by water or land; as, an open harbor or roadstead. Through the gate, Wide open and unquarded, Satan passed. Milton…

Any lid-shaped structure closing the aperture of a tube or shell.

The science which treats of the structure, functions, and diseases of the eye.

in shady places, and is of value for forage and hay. -- Orchard house (Hort.), a glazed structure in which fruit trees are reared in pots. -- Orchard oriole (Zool.), a bright-colored American oriole (Icterus spurius), which frequents orchards. It is smaller and darker thah the Baltimore oriole.

A natural part or structure in an animal or a plant, capable of performing some special action (termed its function), which is essential to the life or well-being of the whole; as, the heart, lungs, etc., are organs of animals; the root, stem, foliage, etc., are organs of plants.

to objects composed of organs; consisting of organs, or containing them; as, the organic structure of animals and plants; exhibiting characters peculiar to living organisms; as, organic bodies, organic life, organic remains. Cf. Inorganic.

Organic. The organical structure of human bodies, whereby they live and move. Bentley.