pioscope
(ˈpaɪəskəʊp)
[irreg. f. Gr. πῖον (sc. γάλα) rich milk (neut. of πῑ́ων fat) + -scope.]
A form of lactometer invented by Heeren, in which the purity of milk is tested by comparing its colour, as seen through the uncoloured part of a plate of glass, with the colours of sectors of the plate painted in various shades from whitish-grey to deep bluish-grey.
| 1884 in Knight Dict. Mech. Suppl. 1895 Syd. Soc. Lex., Pioscope, a form of Lactometer. |