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A stone or mineral on or in which are branching figures resembling shrubs or trees, produced by a foreign mineral, usually an oxide of manganese, as in the moss agate; also, a crystallized mineral having an arborescent form, e. g., gold or silver; an arborization.

A catching; discovery. [Obs.] Bp. Hall.

A method of operating for cataract; couching. See Couch, v. t.,

To disturb in action or function, as a part or organ, or the whole of a machine or organism. A sudden fall deranges some of our internal parts. Blair.

eans, or condition, as profits from capital, conclusions or opinions from evidence. As touching traditional communication, . . . I do not doubt but many of those truths have had the help of that derivation. Sir M. Hale.

To push asunder; to come off or separate from anything; to disengage. [A vapor] detaching, fold by fold, From those still heights. Tennyson.

The act of detaching or separating, or the state of being detached.

l drawing, a drawing of the full size, or on a large scale, of some part of a building, machine, etc. -- In detail, in subdivisions; part by part; item; circumstantially; with particularity.

A machine for tearing or cutting rags, cotton, etc. Blue devils. See under Blue. -- Cartesian devil. See under Cartesian. -- Devil bird (Zoöl.), one of two or more South African drongo shrikes (Edolius retifer, and E. remifer), believed by the natives to be connected with sorcery. -- Devil may care, reckless, defian…

In any animal, esp. of the Herbivora, a rudimentary claw or small hoof not reaching the ground. Some cut off the dewclaws [of greyhounds]. J. H. Walsh.

A treatise on teaching or education. [Obs.] Milton.

Fitted or intended to teach; conveying instruction; preceptive; instructive; teaching some moral lesson; as, didactic essays. "Didactical writings." Jer. Taylor. The finest didactic poem in any language. Macaulay.

Aptitude for teaching. Hare.

The art or science of teaching.

A perforated block, commonly of hardened steel used in connection with a punch, for punching holes, as through plates, or blanks from plates, or for forming cups or capsules, as from sheet metal, by drawing.

de indefinitely small. -- Differential coupling, a form of slip coupling used in light machinery to regulate at pleasure the velocity of the connected shaft. -- Differential duties (Polit. Econ.), duties which are not imposed equally upon the same products imported from different countries. -- Differential galvanome…

lity of diffusing; capable of spreading every way by flowing; spreading widely; widely reaching; copious; diffuse. "A plentiful and diffusive perfume." Hare.

ht like gladiators; to contend fiercely; to dispute violently. [Obs.] Digladiating like Æschines and Demosthenes. Hales.

l depression or indentation on the surface of some part of the body, esp. on the cheek or chin. Milton. The dimple of her chin. Prior.

A part of a machine or instrument which directs its motion or action.