achromat

ach·ro·mat

[ak-ruh-mat]

Origin:
1905–10; by shortening

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achromat (ˈækrəˌmæt) [Click for IPA pronunciation guide]
 
n
1.  Compare apochromat Also called: achromatic lens a lens designed to bring light of two chosen wavelengths to the same focal point, thus reducing chromatic aberration
2.  a person who has no colour vision at all and can distinguish only black, white, and grey. The condition is very rare

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Achromat is always a great word to know.
So is zedonk. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
the offspring of a zebra and a donkey.
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