from The Century Dictionary.
- noun The silken cocoon in which the eggs of most spiders are deposited and in which they hibernate.
- noun In earthworms, one of the reniform sacs which open into the funnel-shaped ends of the oviducts; a receptaculum ovorum.
- noun In crustaceans, as some co-pepods, one of the pair of egg-containing receptacles at the hinder end of the body.
Sorry, no etymologies found.
In any animal species, free from any other condition, such a relation would have inevitably developed sex to an inordinate degree, as may be readily seen in the comparatively similar cases of those insects where the female, losing economic activity and modified entirely to sex, becomes a mere egg-sac, an organism with no powers of self-preservation, only those of race-preservation.
The egg-sac silk of other spider species generally stretches by only 20 to 50 percent before snapping apart.
This morning he emailed me to report that she’s doing well and has an egg-sac now!