- A drinking glass or a goblet.
- A box or a tube with a transparent bottom used for clear observation of things below the surface of a water.
- A sodium silicate; a water-soluble silicate compound.
- A clepsydra; a water clock.
Paraphrased from: American Heritage Dictionary
Making a cheap, home-made
water glass (
cf. hydroscope) is a no-brainer: simply replace the bottom of a
milk carton with a
saran wrap, and tape it down with masking tape. Fun for clearly observing
fishes,
amphibians, and
crustaceans move about in a
pond, etc. without getting your face wet.