achromatic

ADJECTIVE /,ækrə'mætɪk/
10 LETTERS · 4 SYLLABLES · STARTS WITH A

achromatic is a valid 10-letter word worth 19 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
A1C3H4R1O1M3A1T1I1C3
1 + 3 + 4 + 1 + 1 + 3 + 1 + 1 + 1 + 3 =19 PTS
DOUBLE WORD → 38TRIPLE WORD → 57
MEANING

What does achromatic mean?