1935, from Greek tomos "slice, section" (see tome) + -graphy.
Entries linking to tomography
tome n.
1510s, "a single volume of a multi-volume work," from French tome (16c.) or directly from Latin tomus "section of a book, tome," from Greek tomos "volume, section of a book," originally "a section, piece cut off," from temnein "to cut," from PIE root *tem- "to cut." Sense of "a large book" is attested from 1570s.
-graphy
word-forming element meaning "process of writing or recording" or "a writing, recording, or description" (in modern use especially in forming names of descriptive sciences), from French or German -graphie, from Greek -graphia "description of," used in abstract nouns from graphein "write, express by written characters," earlier "to draw, represent by lines drawn," originally "to scrape, scratch" (on clay tablets with a stylus), from PIE root *gerbh- "to scratch, carve" (see carve).