The Collaborative International Dictionary of English v.0.48:
Centigrade \Cen"ti*grade\, a. [L. centum a hundred + gradus
degree: cf. F. centigrade.]
Consisting of a hundred degrees; graduated into a hundred
divisions or equal parts. Specifically: Of or pertaining to
the centigrade thermometer; as, 10[deg] centigrade (or
10[deg] C.). In measurements, abreviated C.
Centigrade thermometer, a thermometer having the zero or 0
at the point indicating the freezing state of water, and
the distance between that and the point indicating the
boiling state of water divided into one hundred degrees.
It is called also the Celsius thermometer, from Anders
Celsius, the originator of this scale. Measurements are
reported as [deg] C.
[1913 Webster] Centigram