onto - oxid
- ontogenesis
- ontogeny
- oocyst
- oogenesis
- opal
- open air rearing
- open channel
- open delivery drill
- open ditch drainage
- open field culture
- open pollination
- open population
- opener
- operation
- operator
- opercle
- operculum
- ophiocarpous
- opium
- opium poppy
- opposite phyllotaxis
- oppositifolious
- oppositional gene
- optical analysis
- optimum allocation
- optimum balance
- optimum condition
- optimum content
- optimum growth temperature
- optimum humus state
- optimum leaf area
- optimum moisture
- optimum period of insemination
- optimum quantity of nutrient elements
- optimum ratio of nutrient elements
- optimum temperature
- optimum water capacity
- orange
- orangery
- orbicular cocoon
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