logo-

1.
a combining form appearing in loanwords from Greek, where it meant “word,” “speech” (logography); on this model, used in the formation of new compound words (logotype).
Also, especially before a vowel, log-.
Compare -logic, -logue, -logy.
Origin
< Greek logo-, combining form of lógos logos
British Dictionary definitions for logo-

logo-

combining form
1.
indicating word or speech: logogram
Word Origin
from Greek; see logos
Word Origin and History for logo-

before vowels log-, word-forming element meaning "speech, word," from Greek logos "word" (see logos).

logo- in Medicine

logo- or log-
pref.
Word; speech: logoplegia.