Definition of ecto- in English:

ecto-

Syllabification: ecto-

combining form

Outer; external; on the outside (used commonly in scientific terms): ectoderm ectoparasite

Origin

from Greek ektos 'outside'.

Definition of ecto- in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something