descent

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de·scent

(dē-sent'),
1. Synonym(s): descensus
2. In obstetrics, the passage of the presenting part of the fetus into and through the birth canal.
[L. descensus]

descent

(dĭ-sĕnt′)
n.
1. The process of descending or falling down from a higher position.
2. The passage of the presenting part of the fetus into and through the birth canal.
3. Hereditary derivation; lineage.

de·scent

(dĕ-sent')
1. Synonym(s): descensus testis.
2. obstetrics The passage of the presenting part of the fetus into and through the birth canal.
[L. descensus]

descent

(di-sent′) [Fr. descente, a climb down]
1. An act or instance of moving from a higher place or location to a lower one, e.g., from the testes to the scrotum.
2. Derivation from a common ancestor; lineage; ancestry.
3. In obstetrics, the movement of a fetus through the pelvis during labor and delivery.
See: Cardinal Movements at Birth - step 3
References in classic literature ?
The valley was now before us; but instead of being conducted into its smiling bosom by the gradual descent of the deep watercourse we had thus far pursued, all our labours now appeared to have been rendered futile by its abrupt termination.
As it was now near sunset we determined to pass the night where we were, and on the morrow, refreshed by sleep, and by eating at one meal all our stock of food, to accomplish a descent into the valley, or perish in the attempt.
We shall, when we come to our chapter on Geology, have to refer again to this subject, and I think we shall then see that the diagram throws light on the affinities of extinct beings, which, though generally belonging to the same orders, or families, or genera, with those now living, yet are often, in some degree, intermediate in character between existing groups; and we can understand this fact, for the extinct species lived at very ancient epochs when the branching lines of descent had diverged less.
There was another interval of utter insensibility; it was brief; for, upon again lapsing into life there had been no perceptible descent in the pendulum.
Notwithstanding terrifically wide sweep (some thirty feet or more) and the its hissing vigor of its descent, sufficient to sunder these very walls of iron, still the fraying of my robe would be all that, for several minutes, it would accomplish.
My eyes followed its outward or upward whirls with the eagerness of the most unmeaning despair; they closed themselves spasmodically at the descent, although death would have been a relief, oh!
On the Height of the Snow-line, and on the Descent of the Glaciers in South America.
As the height of the plane of perpetual snow seems chiefly to be determined by the extreme heat of the summer, rather than by the mean temperature of the year, we ought not to be surprised at its descent in the Strait of Magellan, where the summer is so cool, to only 3500 or 4000 feet above the level of the sea; although in Norway, we must travel to between lat.
I had had to discard my rifle before I commenced the rapid descent of the cliff, so that now I was armed only with a hunting knife, and this I whipped from its scabbard as Kho leaped toward me.
Two examples for the compositions of 17 illustrating these descents are: