a prefix occurring in loanwords from Greek, where it meant "two," "twice," "double" (diphthong); on this model, freely used in the formation of compound words (dicotyledon; dipolar) and in chemical terms (diatomic; disulfide).
Also, dis-2. Cf. mono-.
[ME L < Gk, comb. form repr. dís twice, double, akin to dýo TWO. See BI-, TWI-]
var. of dis-1 before b, d, l, m, n, r, s, v, and sometimes g and j: digest; divide.
var. of dia- before a vowel: diorama.

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Universalium. 2010.

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