| occipital point | The most prominent posterior point on the occipital bone above the inion. (05 Mar 2000) |
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| o-point | <physics> Place where the poloidal magnetic field vanishes in such a way that the nearby flux surfaces are elliptical, for example on the magnetic axis or at the centre of a magnetic island. (See also X-Point.) (09 Oct 1997) |
| end point | <chemistry> It is the completion point during a titration reaction where there are equal amounts of titrant and whatever is being titrated. It is usually evident by the first perceptible alteration of the colour of an added indicator. <immunology> It is the most dilute an antibody or antiserum solution can be while still detectably reacting with the antigen. <statistics> A category of data used to compare the outcome in different arms of a clinical trial. Common endpoints are severe toxicity, disease progression or fall in such surrogate markers as CD4 count, but sometimes death is used as an endpoint. (08 Mar 2000) |
| end-point measurement | Analytical measurement at the end of a chemical reaction, as opposed to making the measurement while the reaction proceeds. (05 Mar 2000) |
| end-point nystagmus | A jerky, physiologic nystagmus occurring in a normal individual when attempts are made to fixate a point at the limits of the field of fixation. Synonym: deviational nystagmus. (05 Mar 2000) |
| trigger point | A specific point or area where, if stimulated by touch, pain, or pressure, a painful response will be induced. Synonym: dolorogenic zone, trigger area, trigger zone. (05 Mar 2000) |
| triple point | The temperature at which all three phases (i.e., solid, liquid, and gas) are in equilibrium; the triple point of water (273.16 K) is a fundamental fixed point in temperature scales. (05 Mar 2000) |
| equivalence point | In a precipitin reaction, the zone in which neither antibody nor antigen is in excess. See: precipitation. Synonym: equivalence point. (05 Mar 2000) |
| Trousseau's point | A painful point, in neuralgia, at the spinous process of the vertebra below which arises the offending nerve. Synonym: apophysary point, apophysial point. (05 Mar 2000) |
| exclamation point hair | <clinical sign> The type of dystrophic anagen hair found at margins of patches of alopecia areata. The bulb is absent. (21 Jun 2000) |
| J point | The point marking the end of the QRS complex and the beginning of the S or T wave in the electrocardiogram. Synonym: ST junction. (05 Mar 2000) |
| jugal point | A craniometric point at the union of the temporal and frontal processes of the zygomatic bone. Synonym: jugal point. (05 Mar 2000) |
| far point | That point in conjugate focus with the retina when the eye is not accommodating. Synonym: punctum remotum. (05 Mar 2000) |
| far point of eye | <microscopy> For the normal eye, the far point is at infinity. The rays of light from an infinitely distant point source are parallel and can be focused with the accommodation muscles of the eye entirely relaxed. See: accommodation, near point of the eye. (05 Aug 1998) |
| zygomaxillary point | A craniometric point located externally at the lowest extent of the zygomaticomaxillary suture. Synonym: key ridge, zygomaxillary point. (05 Mar 2000) |