| sitting | 1. The state or act of one who sits; the posture of one who occupies a seat. 2. A seat, or the space occupied by or allotted for a person, in a church, theater, etc.; as, the hall has 800 sittings. 3. The act or time of sitting, as to a portrait painter, photographer, etc. 4. The actual presence or meeting of any body of men in their seats, clothed with authority to transact business; a session; as, a sitting of the judges of the King's Bench, or of a commission. "The sitting closed in great agitation." (Macaulay) 5. The time during which one sits while doing something, as reading a book, playing a game, etc. "For the understanding of any one of St. Paul's Epistles I read it all through at one sitting." (Locke) 6. A brooding over eggs for hatching, as by fowls. "The male bird . . . Amuses her [the female] with his songs during the whole time of her sitting." (Addison) Sitting room, an apartment where the members of a family usually sit, as distinguished from a drawing-room, parlor, chamber, or kitchen. Source: Websters Dictionary (01 Mar 1998) |
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| cusp height | The shortest distance between the tip of a cusp and its base plane, the shortest distance between the deepest part of the central fossa of a posterior tooth and a line connecting the points of the cusps of the tooth. Facial height, the linear dimension in the midline from the hairline to the menton. Nasal height, the distance between the nasion and the lower border of the nasal aperture. Orbital height, the distance between the midpoints of the upper and lower margins of the orbit. (05 Mar 2000) |
| height | Vertical measurement. Anterior facial height (AFH), in cephalometrics, the linear measurement from the nasion to the menton. Height of contour, the line encircling a tooth or other structure at its greatest bulge or diameter with respect to a selected path of insertion. (05 Mar 2000) |
| height-length index | The relation of the height to the length of the skull: (height × 100)/length. Synonym: height-length index, length-height index, transversovertical index. (05 Mar 2000) |
| height of contour | See: height of contour. (05 Mar 2000) |
| height vertigo | Dizziness experienced when looking down from a great height or in looking up at a high building or cliff. Synonym: vertical vertigo. (05 Mar 2000) |
| pulse height analyzer | Electronic circuitry that determines the energy of scintillations recorded by a detector, allowing use of a discriminator to select for photons of a specific type. (05 Mar 2000) |
| diameter at breast height | The width of a plant stem (for example, tree trunk) as measured at 4.5 feet above the ground surface. (09 Oct 1997) |
| length-height index | The relation of the height to the length of the skull: (height × 100)/length. Synonym: height-length index, length-height index, transversovertical index. (05 Mar 2000) |
| vertex | 1. <anatomy> A turning point; the principal or highest point; top; summit; crown; apex. Specifically: the top, or crown, of the head. 2. <astronomy> The zenith, or the point of the heavens directly overhead. 3. <mathematics> The point in any figure opposite to, and farthest from, the base; the terminating point of some particular line or lines in a figure or a curve; the top, or the point opposite the base. Vertex of a curve, the point in which the axis pierces the surface. The principal vertex of a conic section is, in the parabola, the vertex of the axis of the curve: in the ellipse, either extremity of either axis, but usually the left-hand vertex of the transverse axis; in the hyperbola, either vertex, but usually the right-hand vertex of the transverse axis. Origin: L. Vertex, -icis, a whirl, top of the head, top, summit, from vertere to turn. See Verse, and cf. Vortex. (29 Oct 1998) |
| vertex cordis | The blunt extremity of the heart formed by the left ventricle. See: apex beat. Synonym: apex cordis, vertex cordis. (05 Mar 2000) |
| vertex corneae | The central part of the cornea, slightly thinner than the peripheral part. Synonym: vertex corneae. (05 Mar 2000) |
| vertex of cornea | The central part of the cornea, slightly thinner than the peripheral part. Synonym: vertex corneae. (05 Mar 2000) |
| vertex presentation | See: cephalic presentation. (05 Mar 2000) |
| presentation, vertex | In a vertex presentation, the top of the baby's head comes first at delivery. The vertex here refers specifically to the top of the head the word vertex in latin means a whirlpool, whirlwind, top of the mountain, or the top of the head. Why top of the head ? because the hairs on the top of the head often form a whorl, a whirl-like pattern. (12 Dec 1998) |