from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A lactometer.
from the GNU version of the Collaborative International Dictionary of English
- n. An instrument for ascertaining the quality of milk (i.e., its richness in cream) by determining its specific gravity; a lactometer.
from The Century Dictionary and Cyclopedia
- n. A species of hydrometer for determining the richness of milk by its specific gravity. See hydrometer and lactometer.
Sorry, no etymologies found.
So we have the zoonometer for Galaxy Zoo and the moonometer for Moon Zoo, and we have the galactometer for the Milky Way Project.