yolk stalk n.
A narrow ductlike part that connects the yolk sac to the middle of the digestive tract of an embryo. Also called omphalomesenteric duct.
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |