Oca n. : A Peruvian name for certain species of Oxalis (O. crenata, and O. tuberosa) which bear edible tubers.

Example:
How should I prepare for Oca(oracle cetified associate) certification?

Taxonomy
Orthodox Church in America, the Orthodox Church, Diocese, the OCA, Liturgical Music, Orthodox Resources, Seminaries, Reflections, in Christ, Parish, Scripture Readings, Jonah, Financial Report, Alaska, Orthodox Christianity, Feasts, Saints, Translations.

Defination from the web:
... 10/11 - Metropolitan Jonah, OCA guests of the Orthodox Church of Georgia. 10/11 - IOCC Mobilizes Aid for Asia Pacific Disasters ...