cyano-1

1.
a combining form meaning “blue, dark blue,” used in the formation of compound words:
cyanotype.
Also, especially before a vowel, cyan-1 .
Origin
< Greek kýano(s) dark blue (adj.), dark-blue substance (noun)

cyano-2

1.
a combining form representing cyanide, in the formation of compound words:
cyanogen.
Also, especially before a vowel, cyan-2 .

cyano-3

1.
a combining form used in the names of chemical compounds in which the cyano group is present:
cyanohydrin.
Also, especially before a vowel, cyan-3 .
Origin
combining form representing cyanogen
British Dictionary definitions for cyano-

cyano-

combining form
1.
blue or dark blue: cyanotype
2.
indicating cyanogen: cyanohydrin
3.
indicating cyanide
Word Origin
from Greek kuanos (adj) dark blue, (n) dark blue enamel, lapis lazuli
cyano- in Medicine

cyano- or cyan-
pref.

  1. Blue: cyanosis.

  2. Cyanide: cyanocoalbumin.