| gestation | <obstetrics> The period of development of the young in viviparous animals, from the time of fertilization of the ovum until birth. Origin: L. Gestatio, from gestare = to bear (18 Nov 1997) |
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| gestation sac | The gestation sac is the fluid-filled sac in which the foetus develops, visible with an ultrasound exam. (09 Oct 1997) |
| multiple gestation | <radiology> Incidence: 1% of all births, twins in 1:85; triplets in 1:85x85; etc, uterus large for dates, may have elevated hCG, hPL, and aFP, at risk for IUGR: monochorionic-monoamniotic more than , monochorionic-diamniotic more than , dichorionic-diamniotic findings: 2 placentas indicate dichorionic-diamniotic, 1 placenta indicates monochorionic pregnancy or dichorionic pregnancy with fused placenta, separating membranes confirms diamniotic pregnancy (12 Dec 1998) |
| anodal duration tetanus | An obsolete term for the period of muscular contraction occurring at the anode when the electric circuit is closed. (05 Mar 2000) |
| cathodal duration tetanus | An obsolete term for a tetanic contraction occurring on application of the cathode or negative pole, while the circuit is closed. (05 Mar 2000) |
| half amplitude pulse duration | The time, in milliseconds, required for a wave form to reach half of its full magnitude. (05 Mar 2000) |
| pulse duration | The interval between onset of the leading edge and the end of the trailing edge of a pulse wave. (05 Mar 2000) |
| strength-duration curve | A graph relating the intensity of an electrical stimulus to the length of time it must flow to be effective. See: chronaxie, rheobase. (05 Mar 2000) |
| duration | A continuous period of time. (05 Mar 2000) |
| duration tetany | A tonic spasm occurring in degenerated muscles upon application of a strong galvanic current. (05 Mar 2000) |