| a combining form meaning “other,” used in the formation of compound words (allotrope) and in chemistry to denote the more stable of two geometric isomers. Also (except in chemistry), especially before a vowel, all-. |
| allo- or all- pref.
[Greek, from allos, other; see al-1 in Indo-European roots.] |
allo- or all-
pref.
Other; different: allotransplantation.
Isomeric: allomorphism.