Definition of chloro- in English:

chloro-

Pronunciation: /ˈklɔːrəʊ, ˈklɒrəʊ/
(usually chlor- before a vowel)

combining form

1 Biology & Mineralogy Green.
2 Chemistry representing chlorine. chloroquine

Origin

from Greek khlōros 'green'.

Definition of chloro- in:

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Word of the day internecine
Pronunciation: ˌintərˈnesēn
adjective
destructive to both sides in a conflict