deferent

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deferent

(def -ĕ-rĕnt) See Ptolemaic system.

Deferent

 

an auxiliary circle in the Ptolemaic geocentric system of the world, introduced to explain the complex motions of planets. It was assumed that the center of the epicycle—another auxiliary circle—moves around the circumference of the deferent, at whose center lies the earth; the planet itself moves along the circumference of an epicycle.

deferent

[′def·ə·rənt]
(astronomy)
An imaginary circle around the earth, postulated by Ptolemy, in whose circumference a celestial body or its epicycle is supposed to move.
References in periodicals archive ?
Males are generally classified as mature based on the enlargement of vas deferens and its physical appearance (milky white coloration).
In a second specimen there was a dense round structure located on the vas deferens.
2,11,12) In patients with a BMI above 40, visualization and manipulation of the penis and scrotum may be seriously impaired (13); palpation of the vas deferens may be difficult or impossible; and surgery may become protracted and complicated.
The mesonephric duct differentiates into the bladder trigone, the seminal vesicle, the ductus deferens, and the distal two-thirds of the epididymis.
A transrectal ultrasound (TRUS) will determine if the seminal vesicles and vas deferens close to the prostate are normal.
The spermatophores taken from the male posterior vas deferens did not show dehiscence during 90 min of contact with seawater.
It is a little more tricky as the vas deferens, the tube that carries sperm, is more difficult to identify, but then most acts of veterinary surgery are more demanding
After a local anaesthesia, the drug is injected in vas deferens -- the vessel through which sperm moves.
Regarding males, spawning capable specimens with their vas deferens full of sperm or actively spawning (with part of these vessels empty) were present almost all months of the year (Figs.
Monash IVF team reported the world's first pregnancy achieved by surgical sperm retrieval from a patient with bilateral vas deferens ducts obstruction (6).
Epiphallus extremely long and convoluted, its convolutions and those of vas deferens enveloped in membranous covering of connective tissue and attached to lower spermoviduct and free oviduct; a short flagellum present at junction of vas deferens and epiphallus; interior wall of epiphallus with one large longitudinal pilaster and 6 or 7 smaller longitudinal ridges, these continue into flagellum, evanescing near its tip; vas deferens discharges into epiphallus via a pore situated on large pilaster; vas deferens passing over and down lower sperm-oviduct to its origin at base of prostate; lumen of vas deferens for the most part simple, but broadening just prior to junction with epiphallus, and inner wall with 3 longitudinal folds each with side branches.