o·dom·e·ter (?-d?m??-t?r)n. An instrument that indicates distance traveled by a vehicle.[French odomètre, from Greek hodometron : hodos, journey + metron, measure; see -meter.]o·dom?e·try n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.