Dihedral angle, the angular space contained between planes which intersect. It is measured by the angle made by any two lines at right angles to the two planes.

(Di*he"dron) n. [See Dihedral.] A figure with two sides or surfaces. Buchanan.

(Di*graph"ic) a. Of or pertaining to a digraph. H. Sweet.

(Di*gress") v. i. [imp. & p. p. Digressed ; p. pr. & vb. n. Digressing.] [L. digressus, p. p. of digredi to go apart, to deviate; di- = dis- + gradi to step, walk. See Grade.]

1. To step or turn aside; to deviate; to swerve; especially, to turn aside from the main subject of attention, or course of argument, in writing or speaking.

Moreover she beginneth to digress in latitude.

In the pursuit of an argument there is hardly room to digress into a particular definition as often as a man varies the signification of any term.

2. To turn aside from the right path; to transgress; to offend. [R.]

Thy abundant goodness shall excuse
This deadly blot on thy digressing son.

(Di*gress"), n. Digression. [Obs.] Fuller.

(Di*gres"sion) n. [L. digressio: cf. F. digression.]

1. The act of digressing or deviating, esp. from the main subject of a discourse; hence, a part of a discourse deviating from its main design or subject.

The digressions I can not excuse otherwise, than by the confidence that no man will read them.
Sir W. Temple.

2. A turning aside from the right path; transgression; offense. [R.]

Then my digression is so vile, so base,
That it will live engraven in my face.

3. (Anat.) The elongation, or angular distance from the sun; — said chiefly of the inferior planets. [R.]

(Di*gres"sion*al) a. Pertaining to, or having the character of, a digression; departing from the main purpose or subject. T. Warton.

(Di*gress"ive) a. [Cf. F. digressif.] Departing from the main subject; partaking of the nature of digression. Johnson.

(Di*gress"ive*ly), adv. By way of digression.

(Digue) n. [F. See Dike.] A bank; a dike. [Obs.] Sir W. Temple.

(||Di*gyn"i*a) n. [NL., fr. Gr. di- = di`s- twice + a woman, a female.] (Bot.) A Linnæan order of plants having two styles.

(Di*gyn"i*an Dig"y*nous) a. [Cf. F. digyne.] (Bot.) Of or pertaining to the Digynia; having two styles.

(Di*he"dral) a. [Gr. di- = di`s- twice + a seat, bottom, base, fr. to sit. Cf. Diedral.] Having two plane faces; as, the dihedral summit of a crystal.

  By PanEris using Melati.

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