- octapodyA metre or verse of eight feet.
- octo-eight
- octodontidAny of the Octodontidae, a family of rodents including the common degu (Octodon degus) and 12 other South American species
- yocto-In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻²⁴ short scale septillionth or long scale quadrillionth).
- yotta-In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10²⁴ (a short scale septillion or long scale quadrillion). Symbol: Y