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In Old English, the article the, when the following word began with a vowel, was often written with elision as if a part of the word. Thus in Chaucer, the forms thabsence, tharray, thegle, thend, thingot, etc., are found for the absence, the array, the eagle, the end, etc.

See Thatch, Thatcher. [Obs. or Prov. Eng. & Scot.]

To thwack. [Obs.] Chaucer.

The segment of the brain next in front of the midbrain, including the thalami, pineal gland, and pituitary body; the diencephalon; the interbrain.

Of or pertaining to a thalamus or to thalami.

Bearing the stamens directly on the receptacle; -- said of a subclass of polypetalous dicotyledonous plants in the system of De Candolle.

The cavity or ventricle of the thalamencephalon; the third ventricle.

Same as Foraminifera.

A mass of nervous matter on either side of the third ventricle of the brain; -- called also optic thalamus.

Any sea tortoise.

Of or pertaining to the sea; -- sometimes applied to rocks formed from sediments deposited upon the sea bottom.

Any species of Thalaassinidæ, a family of burrowing macrurous Crustacea, having a long and soft abdomen.

The study or science of the life of marine organisms. Agassiz.

A German silver coin worth about three shillings sterling, or about 73 cents.

That one of the nine Muses who presided over comedy.

A division of Tunicata comprising the free-swimming species, such as Salpa and Doliolum.

Of or pertaining to Thalia; hence, of or pertaining to comedy; comic.

A salt of a hypothetical thallic acid.

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

Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a higher valence as contrasted with the thallous compounds; as, thallic oxide.