combining form
or allo-
Etymology: Greek, from allos other, different — more at else
1. : other : different : dissimilar : extraneous
all ergy
allo pathy
allo sematic
2. allo- : isomeric form, close relative, or variety of (a specified chemical compound)
allo -ocimene
allo telluric acid
as
a. : the more stable form (of two geometrical isomers)
allo cinnamic acid
b. : trans- 3 — especially in names of stereoisomeric compounds containing two fused saturated rings
allo cholanic acid
allo pregnane
3. usually allo- : having dissimilar genomes
allo heteroploid
allo ploid
allo triploid
— opposed to aut-