μεσό-λευκος · meso-leukos — LSJ
middling white, χιτὼν πορφυροῦς μ. a tunic of purple shot with white, X. Cyr. 8.3.13, cf. Luc. Alex. 11; μ. χιτών alone, JHS 41.195 (Delos, ii B. C.), D.C. 36.52; opp. πορφύρεος, Ephipp. ap. Ath. 12.537e; χλαμὺς μ. D.C. 78.3.
Subst., a precious stone, Plin. HN 37.174.
= λευκὰς ὀρεινή, ib. 27.102.