early 19c., of writing, from holograph + -y (4); physics sense, "process of using holograms," is from 1964, coined by discoverer, Hungarian-born physicist Gábor Dénes, from hologram on analogy of telegraphy/telegram.
holocaust
Holocene
hologram
holograph
holographic
holography
holomorphic
holophrastic
Holstein
holster
holt