Yolk cord (Zoöl.), a slender cord or duct which connects the yolk glands with the egg chambers in certain insects, as in the aphids. -- Yolk gland (Zoöl.), 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.
Yoll (yl), v. i. To yell. [Obs.] Chaucer.
Yon (yn), a. [OE. yon, on, AS. geon; akin to G. jener, OHG. jenr, Icel. enn, inn; cf. Goth. jains. √188. Cf. Beyond, Yond, Yonder.] At a distance, but within view; yonder. [Poetic]
Read thy lot in yon celestial sign.
Milton.
Though fast yon shower be fleeting.
Keble.