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In internal-combustion engines with electric ignition, a plug, screwed into the cylinder head, having through it an insulated wire which is connected with the induction coil or magneto circuit on the outside, and forms, with another terminal on the base of the plug, a spark gap inside the cylinder.

egular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side.

A genus of common motile microörganisms (Spirobacteria) having the form of spiral-shaped filaments. One species is said to be the cause of relapsing fever.

The quality or state of being spiritual or spiritual-minded; spirituality.

A hydrocarbon obtained from coal-tar residues, and remarkable for its intense yellowish green fluorescence.

Having three ports; specif.: Designating a type of two-cycle internal-combustion engine in which the mixture enters the crank case through a port uncovered by the piston near the end of its stroke.

an extensive family of languages of simple structure and low grade (called also Altaic, Ural-Altaic, and Scythian), spoken in the northern parts of Europe and Asia and Central Asia; of pertaining to, or designating, the people who speak these languages.

A beam filled with spikes to obstruct passage; a cheval-de- frise. [R.] Turnpike man, a man who collects tolls at a turnpike. -- Turnpike road, a road on which turnpikes, or tollgates, are established by law, in order to collect from the users tolls to defray the cost of building, repairing, etc.

A two-stroke cycle for an internal-combustion engine. --Two"- cy`cle, a.

Having two ports; specif.: Designating a type of two-cycle internal-combustion engine in which the admission of the mixture to the crank case is through a suction valve.

w, or act of an officer. Burke. -- Un*con`sti*tu"tion*al"i*ty, n. -- Un*con`sti*tu"tion*al-ly, adv.