[ trʌɪ'krəʊɪk ]
■ adjective (of a crystal) appearing with different colours when viewed along the three crystallographic directions.
Derivatives
trichroism 'trʌɪkrəʊɪz(ə)m noun
Origin
C19: from Gk trikhroos (from tri- 'three' + khrōs 'colour') + -ic .