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Browsing letter [O]
O horizon
Oa horizon
oak apple
object
object database management system
objective
objective function
obligate
obligate parasite
oblique aerial photograph
observation well
occluded front
occlusion
ochric epipedon
ocular-estimate-by-plot method
Oe horizon
off-highway vehicle
off-road vehicle
ogee
Oi horizon
old-growth forest
oleoresin
oligogene
oligotrophic
ombrotrophic
omnivory
on-grade
one-lick method
one-to-many
ontogeny
open defect
open herding
open pollination
open range
open-pollinated progeny
operating system
operations research
operations section chief
opportunity cost
optical square
optimal solution
optimum land use
optimum road spacing
oral toxicity
organ
organic pesticide
organic soil
organochlorine
organogenesis
organophosphate
organosulfur
oriented-strand board
original source
ornithophily
ornithophily pollination
orographic precipitation
orophyte
ortet
orthogonality
orthophotograph
orthophotomap
orthotropism
ortstein
ORV
OS
OSB
outcrossing
outfall
outlet
outplanting
output
output and substitution effects
outwash
outwash plain
ovary
oven-dry
over-all application
over-browsing
overbrowsing
overcut
overdominance
overgrazing
overhead
overhead cost
overland flow
overlap
overlay
overmature
overrun
overshoot
overstory
overstory removal
overtopped
overwintering fire
ovicide
oviparous
ovoviviparous
ovulate
ovule
oxic horizon
oxygen demand
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