| diaster | <biology> A double star; applied to the nucleus of a cell, when, during cell division, the loops of the nuclear network separate into two groups, preparatory to the formation of two daughter nuclei. See Karyokinesis. Origin: Gr. - = twice + star. Source: Websters Dictionary (01 Mar 1998) |
|---|---|
| diastereoisomers | Optically active isomers that are not enantiomorphs (mirror images); e.g., d-glucose and d-galactose. (05 Mar 2000) |
| diastereomers | <chemistry> Optical isomers that are not mirror images of each other. (09 Jan 1998) |
| diastole | The time, in between ventricular contractions (systole), at which ventricular filling occurs. (27 Sep 1997) |
| diastolic | Of or pertaining to the diastole. (18 Nov 1997) |
| diastolic afterpotential | In the heart, a transmembrane potential change following repolarization, which may reach threshold magnitude and cause a rhythm disturbance; often recorded in poisoning, as by digitalis overdosage. (05 Mar 2000) |
| diastolic blood pressure | The pressure exerted on the walls of the arteries when the heart is in the relaxation phase (diastole). Considered abnormally elevated if consistently over 90 mmhg. (27 Sep 1997) |
| diastolic murmur | A murmur heard during diastole. (05 Mar 2000) |
| diastolic pressure | The intracardiac pressure during or resulting from diastolic relaxation of a cardiac chamber; the lowest arterial blood pressure reached during any given ventricular cycle. (05 Mar 2000) |
| diastolic shock | The abnormally palpable impact, appreciated by a hand on the chest wall, of an accentuated third heart sound. (05 Mar 2000) |
| diastolic thrill | A thrill felt over the precordium or over a blood vessel during ventricular diastole. (05 Mar 2000) |
| diastrophic dwarfism | <radiology> Short-limbed dwarfism (diastrophic means twisted, thus scoliosis) X-ray features: short flared metaphyses with flattened epiphyses in tubular bones of extremities, equinovarus deformity of feet -- major joints subluxed, spine: kyphoscoliosis with gradual decrease in interpediculate distance toward caudal end of lumbar spine, hands, hitch-hiker's thumb - widely abducted, hypoplastic first metacarpal, other metacarpals too broad, especially at growing end, carpal bones with too many centres ossified (12 Dec 1998) |
| diastrophism | Distortion that occurs in objects as a result of bending. Origin: G. Diastrophe, fr. Diastrephein, distortion (05 Mar 2000) |