| 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) |
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| 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 convergence | The point to which the visual lines are directed when convergence is at rest. (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) |
| flash point | The lowest temperature at which vapors of a liquid may be ignited by a flame. (05 Mar 2000) |
| focal point | Location of an organism, for fish, usually the position of the snout. Habitat measurements made at that position (depth, water velocity, etc.) are focal point measurements. (09 Oct 1997) |
| freezing point | <physics> The temperature at which a liquid solidifies. (05 Mar 2000) |
| leak point pressure | Storage pressure in bladder at which leakage occurs passively, usually in patients with neuropathic bladder. (05 Mar 2000) |
| fusing point | See: fusion temperature (wire method). (05 Mar 2000) |