etio-

etio-

(ē'tē-ō),

1. Prefix used with, for example, cholane to indicate replacement of the C-17 side chain by H; thus, etiocholane is the 5β isomer of androstane.

2. Combining form meaning cause.

aetio-

The Greek root for “cause”, as in aetiology.

etio-

[Gr. aitia, cause]

Prefix meaning causation. The variant aetio- is used outside the U.S.