As a pronoun co
is this; this one.
As a noun syn is
sight (especially denoting line of sight, the ability to see something particular).
co
Translingual
Symbol
(
head)
The ISO 3166-1 two-letter (alpha-2) code for Colombia.
The molecular formula for carbon monoxide.
ISO 3166-1
----
syn
English
Adjective
(
en adjective)
(chemistry) That has a torsion angle between 0° and 90°.
Coordinate terms
* (chemistry) anti
Anagrams
*
----