Definition of ecto- in English:

ecto-

Pronunciation: /ˈɛktəʊ/

combining form

Outer; external: ectoderm

Origin

from Greek ektos 'outside'.

Definition of ecto- in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)