ecto-

American  

1. a combining form meaning “outer,” “outside,” “external,” used in the formation of compound words.

   ectoderm.

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ecto- British  

combining form

1. indicating outer, outside, external

   ectoplasm

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Etymology

Origin of ecto-

Combining form of Greek ektós outside

Example Sentences

Atkinson gave us an interesting little discourse on parasitology, with a brief account of the life history of some ecto- and some endo-parasites—Nematodes, Trematodes.

From Scott's Last Expedition Volume I by Scott, Robert Falcon

Metablastic: relating to the ecto- or meta-blast or ectoderm.

From Explanation of Terms Used in Entomology by Smith, John. B.