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An oily, volatile hydrocarbon, obtained by the distillation of caoutchouc or guttaipercha.C5H8 -- unsaturated, and used to make synthetic rubber by polymerization. In organic chemistry, viewed conceptually as the building block of the terpene series of hydrocarbons

ferent regions of a medium; passing through points at which the density is equal; as, an isopycnic line or surface.

The middle bark of a tree; the green layer of bark, usually soon covered by the outer or corky layer, and obliterated.

See Glabella.

The parenchyma of a leaf between the skin of the two surfaces. Gray.

The nucleus of a cell; mesoblast. Agassix.

Of or pertaining to the mesopodialia or to the parts of the limbs to which they belong.

One of the bones of either the carpus or tarsus.

The middle portion of the foot in the Gastropoda and Pteropoda.

The middle one of the three principal basal cartilages in the fins of fishes. -- Me*sop`ter*yg"i*al, a.

Having a medium compass between the soprano and contralto; -- said of the voice of a female singer. -- n.

A piece of bread sopped in milk; figuratively, an effeminate or weak-minded person. Shak. To wed a milksop or a coward ape. Chaucer.

Wrong opinion. [Obs.]

A philosophical or learned fool. [Obs.]

Connected with both the nose and the palate; as, the nasopalatine or incisor, canal connecting the mouth and the nasal chamber in some animals; the nasopalatine nerve.

Of or pertaining to both throat and nose; as, a nasopharyngeal polypus.

An iodine compound obtained as a yellowish gray, odorless, tasteless powder by the action of iodine on phenolphthalein.

Morbid dread of disease.

Producing diseases. [R.] Arbuthnot.

Same as Esophagus, Esophageal, etc.