trichroic
Concise Oxford English Dictionary © 2008 Oxford University Press:
trichroic /trʌɪˈkrəʊɪk/
▶adjective (of a crystal) appearing with different colours when viewed along the three crystallographic directions.
– derivatives
trichroism /ˈtrʌɪkrəʊɪz(ə)m/ noun.
trichroism /ˈtrʌɪkrəʊɪz(ə)m/ noun.
'trichroic' also found in these Oxford entries:

