Photochronography \Pho`to*chro*nog"ra*phy\, n. Art of recording or measuring intervals of time by the photochronograph. -- {Pho`to*chron`o*graph"ic}, {-graph"ic*al}, a. -- {Pho`to*chron`o*graph"ic*al*ly}, adv. [Webster 1913 Suppl.]