| var. of ecto- before a vowel: ectal. |
| a combining form meaning “outer,” “outside,” “external,” used in the formation of compound words: ectoderm. |
| ECT abbr. electroconvulsive therapy |
ECT abbr.
electroconvulsive therapy
ecto- or ect-
pref.
Outer; external: ectoparasite.
| ECT electroconvulsive therapy |