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k of each subdivision of a column of troops, or at the end of a line, to mark the pivots, formations, marches, and alignments in tactics. Farrow. Guide bar (Mach.), the part of a steam engine on which the crosshead slides, and by which the motion of the piston rod is kept parallel to the cylinder, being a substitute fo…

A board, as upon a guidepost having upon it directions or information as to the road. Lowell.

A book of directions and information for travelers, tourists, etc.

erbivorous dinosaur of great size, allied to the iguanodon. It is found in the Cretaceous formation.

The transformation of venous arterial blood by respiration; hematosis.

Blood formative; -- applied to a substance in early fetal life, which breaks up gradually into blood vessels.

The lower group of the Wealden formation; -- so called from its development around Hastings, in Sussex, England.

The act or state of one who, or that which, heads; formation of a head.

To be informed by oral communication; to be told; to receive information by report or by letter. I have heard, sir, of such a man. Shak. I must hear from thee every day in the hour. Shak. To hear ill, to be blamed. [Obs.] Not only within his own camp, but also now at Rome, he heard ill for his temporizing and slow proc…

To inquire; to seek information. [Obs.] "Hearken after their offense." Shak.

o strain to do something difficult. The Church of England had struggled and heaved at a reformation ever since Wyclif's days. Atterbury.

The arterialization of the blood in the lungs; the formation of blood in general; hæmatogenesis.

In evolution, a deviation from the typical sequence in the formation of organs or parts.

Relating to heterogenesis; as, heterogenetic transformations.

An abnormal formation foreign to the economy, and composed of elements different from those are found in it in its normal condition. Dunglison.

The formation and development of organic tissues; histogeny; -- the opposite of histolysis.

Tissue-producing; connected with the formation and development of the organic tissues.

The science which treats of the laws relating to organic tissues, their formation, development, functions, etc.

uiry; the knowledge of facts and events, so obtained; hence, a formal statement of such information; a narrative; a description; a written record; as, the history of a patient's case; the history of a legislative bill.

The formation of homologous tissues.