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A division of Arachnida including those that breathe only by means of tracheæ. It includes the mites, ticks, false scorpions, and harvestmen.

An extensive division of arthropods comprising all those which breathe by tracheæ, as distinguished from Crustacea, which breathe by means of branchiæ.

A division of acalephs in which the development is direct from the eggs, without a hydroid stage. Some of the species are parasitic on other medusæ.

re. [Obs.] As if all these troubles had not been sufficient to travail the realm, a great division fell among the nobility. Hayward.

An ornamental foliation consisting of three divisions, or foils.

A division, class, or distinct portion of a people, from whatever cause that distinction may have originated; as, the city of Athens was divided into ten tribes.

Division into three parts.

A division consisting of three signs.

A division of Coleoptera including those which have but three joints in the tarsi.

A poetical division of verse, consisting of three measures. Lowth.

A division of chelonians which comprises Trionyx and allied genera; -- called also Trionychoides, and Trionychina.

A division by threes, or into three parts; the taking of a third part of any number or quantity.

The three divisions, or "baskets" (pitakas), of buddhist scriptures, -- the Vinayapitaka [Skr. Vinayapitsaka] , or Basket of Discipline; Suttapitaka [Pali] , or Basket of Discourses; and Abhidhammapitaka [Pali] , or Basket of Metaphysics.

The division of a thing into three parts, Specifically: (Geom.) the division of an angle into three equal parts.

One of three ancient divisions of a county in England; -- now called riding. [Written also riding.] Blackstone.

A division of birds comprising the humming birds.

A division of annelids including those which construct, and habitually live in, tubes. The head or anterior segments usually bear gills and cirri. Called also Sedentaria, and Capitibranchiata. See Serpula, and Sabella.

An extensive division of Hydroidea; the tubularians; -- called also Athecata, Gymnoblastea, and Tubulariæ.

A grand division of the animal kingdom, intermediate, in some respects, between the invertebrates and vertebrates, and by some writers united with the latter. They were formerly classed with acephalous mollusks. The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two open…

An extensive division of mankind including the Mongols and allied races of Asia, together with the Malays and Polynesians.