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What does OP stand for?

OP stands for Open Pollinated (botany)

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Other Resources:
We have 29 other meanings of OP in our Acronym Attic

Samples in periodicals archive:

Open pollinated older varieties will produce seed capable of germinating but there is no guarantee that they will be true to their original parent and very often the colours become insignificant or muddy.