| diagonal | <geometry> Joining two not adjacent angles of a quadrilateral or multilateral figure; running across from corner to corner; crossing at an angle with one of the sides. Diagonal bond Same as Cross bedding, under Cross. Origin: L. Diagonalis, fr. Gr. From to angle; through + an angle; perh. Akin to E. Knee: cf. F. Diagonal. Source: Websters Dictionary (01 Mar 1998) |
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| diagonal conjugate | The anteroposterior dimension of the inlet that measures the clinical distance from the promontory of the sacrum to the lower margin of the symphysis pubica. Synonym: conjugata diagonalis, diagonal conjugate diameter, false conjugate. (05 Mar 2000) |
| diagonal conjugate diameter | The anteroposterior dimension of the inlet that measures the clinical distance from the promontory of the sacrum to the lower margin of the symphysis pubica. Synonym: conjugata diagonalis, diagonal conjugate diameter, false conjugate. (05 Mar 2000) |
| diagonal section | A diagonal cross section attained by slicing, actually or through imaging techniques, the body or any part of the body or anatomic structure, in any plane which does not parallel the longitudinal axis or intersect it at a right angle, i.e., which is neither longitudinal (vertical) nor transverse (horizontal). Synonym: diagonal section. (05 Mar 2000) |
| diagonalis stria | See: Broca's diagonal band. (05 Mar 2000) |
| diagram | 1. <geometry> A figure or drawing made to illustrate a statement, or facilitate a demonstration; a plan. 2. Any simple drawing made for mathematical or scientific purposes, or to assist a verbal explanation which refers to it; a mechanical drawing, as distinguished from an artistical one. Indicator diagram. <engineering> See Indicator card, under indicator Origin: Gr, fr. To mark out by lines; through + to draw, write: cf. F. Diagramme. See Graphic. Source: Websters Dictionary (01 Mar 1998) |
| diagraph | A drawing instrument, combining a protractor and scale. Origin: Gr. To draw: cf. F. Diagraphe. See Diagram. Source: Websters Dictionary (01 Mar 1998) |
| diagraphic | Alternative form of descriptive. Origin: Cf. F. Diagraphique. Source: Websters Dictionary (01 Mar 1998) |
| diagraphical | Alternative form of descriptive. Origin: Cf. F. Diagraphique. Source: Websters Dictionary (01 Mar 1998) |
| diagraphics | The art or science of descriptive drawing; especially, the art or science of drawing by mechanical appliances and mathematical rule. Source: Websters Dictionary (01 Mar 1998) |
| diaheliotropic | <botany> Relating or, or manifesting, diaheliotropism. Origin: Gr. Through, at variance + sun + turning. Source: Websters Dictionary (01 Mar 1998) |
| diaheliotropism | <botany> A tendency of leaves or other organs of plants to have their dorsal surface faced towards the rays of light. Source: Websters Dictionary (01 Mar 1998) |
| diakinesis | The final stage of the first prophase of meiosis. The chromosomes condense to their greatest extent during this stage and normally the nucleolus disappears and the fragments of the nuclear envelope disperse. (18 Nov 1997) |
| dial | 1. An instrument, formerly much used for showing the time of day from the shadow of a style or gnomon on a graduated arc or surface; especially, a sundial; but there are lunar and astral dials. The style or gnomon is usually parallel to the earth's axis, but the dial plate may be either horizontal or vertical. 2. The graduated face of a timepiece, on which the time of day is shown by pointers or hands. 3. A miner's compass. <zoology> Dial bird, an Indian bird (Copsychus saularius), allied to the European robin. The name is also given to other related species. Dial lock, a lock provided with one or more plates having numbers or letters upon them. These plates must be adjusted in a certain determined way before the lock can be operated. Dial plate, the plane or disk of a dial or timepiece on which lines and figures for indicating the time are placed. Origin: LL. Dialis daily, fr. L. Dies day. See Deity. 1. To measure with a dial. "Hours of that true time which is dialed in heaven." (Talfourd) 2. <chemical> To survey with a dial. Origin: Dialed or Dialled; Dialing or Dialling. Source: Websters Dictionary (01 Mar 1998) |
| dial manometer | aneroid manometer |