oak
oak ageing
oak barrel
oak chips
oak cubes
oak grain
oak lactone
oak shavings
oak wood
oak wood powder
oblate berry
obovoid berry
obscuration
ochratoxin A
odour
Oechsle
Oenococci
Oenococcus oeni
oenologist
oenology
oenophile
oenotannin
off-dry wine
off-flavour
off-load bin
off-odour
offset disc harrow
Oidium
oily
old wine
old wood
Old World
olfactory
oloroso
omega grafting
omega-shaped cut
oospore
open furrow

open quarantine
open-top fermenter
optimal growth
optimal ripeness
optimum growth
optimum ripeness
ordinary
ordinary wine
organelle
organic acid
organic fertiliser
organic fertilizer
organic viticulture
organic wine
organic wine making
organoleptic
orifice plate
ORP
osmosis
ouillage
outlet pipe
oval berry
ovary
overcropping
overhead irrigation
ovoid berry
ovule
own-rooted vine
oxidase
oxidation
oxidation-reduction potential
oxidized
oxygen
oxygen meter
oxygen scavenger
oxygen transmission rate