spiro-
Concise Oxford English Dictionary © 2008 Oxford University Press:
spiro-1
▶combining form
- 1 spiral; in a spiral: spirochaete.
- 2 Chemistry denoting a molecule with two rings with one atom common to both.
– origin from L. spira, Gk speira ‘a coil’.
Concise Oxford English Dictionary © 2008 Oxford University Press:
spiro-2
▶combining form relating to breathing: spirometer.
– origin formed irregularly from L. spirare ‘breathe’.
'spiro-' also found in these Oxford entries:

