Yolk cord
Yolk Yolk (y[=o]lk or y[=o]k; 277), n. [OE. yolke, yelke, [yogh]olke, [yogh]elke, AS. geoloca, geoleca, fr. geolu yellow. See {Yellow}.] [Written also {yelk}.] [1913 Webster] 1. The yellow part of an egg; the vitellus. [1913 Webster]

2. (Zo["o]l.) An oily secretion which naturally covers the wool of sheep. [1913 Webster]

{Yolk cord} (Zo["o]l.), a slender cord or duct which connects the yolk glands with the egg chambers in certain insects, as in the aphids.

{Yolk gland} (Zo["o]l.), a special organ which secretes the yolk of the eggs in many turbellarians, and in some other invertebrates. See Illust. of {Hermaphrodite} in Appendix.

{Yolk sack} (Anat.), the umbilical vesicle. See under {Unbilical}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • yolk cord — noun : a slender protoplasmic cord that connects the yolk glands with the egg chambers in an insect (as an aphid) …   Useful english dictionary

  • Yolk — (y[=o]lk or y[=o]k; 277), n. [OE. yolke, yelke, [yogh]olke, [yogh]elke, AS. geoloca, geoleca, fr. geolu yellow. See {Yellow}.] [Written also {yelk}.] [1913 Webster] 1. The yellow part of an egg; the vitellus. [1913 Webster] 2. (Zo[ o]l.) An oily… …   The Collaborative International Dictionary of English

  • Yolk gland — Yolk Yolk (y[=o]lk or y[=o]k; 277), n. [OE. yolke, yelke, [yogh]olke, [yogh]elke, AS. geoloca, geoleca, fr. geolu yellow. See {Yellow}.] [Written also {yelk}.] [1913 Webster] 1. The yellow part of an egg; the vitellus. [1913 Webster] 2. (Zo[… …   The Collaborative International Dictionary of English

  • Yolk sack — Yolk Yolk (y[=o]lk or y[=o]k; 277), n. [OE. yolke, yelke, [yogh]olke, [yogh]elke, AS. geoloca, geoleca, fr. geolu yellow. See {Yellow}.] [Written also {yelk}.] [1913 Webster] 1. The yellow part of an egg; the vitellus. [1913 Webster] 2. (Zo[… …   The Collaborative International Dictionary of English

  • Yolk sac — Infobox Embryology Name = Yolk sac Latin = GraySubject = 11 GrayPage = 54 Caption = Human embryo of 2.6 mm. Caption2 = Human embryo from thirty one to thirty four days System = CarnegieStage = 5b Days = 9 Precursor = endoderm GivesRiseTo =… …   Wikipedia

  • Cord — Short and informal reference to the spinal cord, the major column of nerve tissue that is connected to the brain, lies within the vertebral canal, and from which the spinal nerves emerge. The spinal cord and the brain constitute the central… …   Medical dictionary

  • Umbilical cord — of a three minute old child. A medical clamp has been applied. Latin funiculus umbilicalis Code …   Wikipedia

  • Umbilical cord — The cord that connects the developing fetus with the placenta. Within this cord run the two umbilical arteries and the umbilical vein. At birth, the umbilical cord is clamped and cut. Its residual tip forms the umbilicus (naval). * * * umbilical… …   Medical dictionary

  • funicular cord — Umbilical Um*bil ic*al, a. [Cf. F. ombilical. See {Umbilic}, n.] 1. (Anat.) Of or pertaining to an umbilicus, or umbilical cord; umbilic. [1913 Webster] 2. Pertaining to the center; central. [R.] De Foe. [1913 Webster] {Umbilical cord}. (a) (Anat …   The Collaborative International Dictionary of English

  • Umbilical cord — Umbilical Um*bil ic*al, a. [Cf. F. ombilical. See {Umbilic}, n.] 1. (Anat.) Of or pertaining to an umbilicus, or umbilical cord; umbilic. [1913 Webster] 2. Pertaining to the center; central. [R.] De Foe. [1913 Webster] {Umbilical cord}. (a) (Anat …   The Collaborative International Dictionary of English

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