n.
Variant: or allo-
Function: combining form
Etymology: Greek, from allos other ― more at ELSE
1 : other : different : atypical < allo gamous> < allo tropy>
2 allo- : isomeric form or variety of (a specified chemical compound) < allo purinol>
3 allo- : being one of a group whose members together constitute a structural unit especially of a language < allo phone>