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 History of this Word

"ecto" is from "ek" (out) spoken by people of Greece starting about 1000 B.C.

Notes

In this sense, it is a word added to another word to form a new word.

More words with this prefix,
ectotherm
ectoplasm
ectocyst
ectophyte

Words related to this meaning

grammar is modifier

"ecto-" is a type of prefix

Definition

A prefix added to the start of a word. Indicates that "outside" modifies the word. Created to expand meanings. Can be used with many words to form new words.

Examples of how the word is used

ecto- illustration Ectoderm, the most exterior germ layer, forms skin, brain, the nervous system, and other external tissues.
ecto- illustration Ectomere, the more transparent cells, which finally become external, in many ova, as those of mammals.