O字彙

oak tree
obtuse angle
OCB（oil circuit breaker）
octagon
octagonal dome
octahedron
octant
OCT（octagon）
OC（on center）
odentograph
OD（outside diameter）
ogival section
oil circuit breaker（OCB）
oiling diagram
old Roman letters
omitted dimension
omnigraph
opaque plane
operations planning
orchard
ordinary work
organic finish
organization chart
ornament
orthocenter
orthograph
other side
outlet
outstanding feature
outward curvature
over dimensioning
overrunning line
oversize
ovular
oxyacetylene welding
ozalid print
OZ（ounce）

object
object line

oblate ellipsoid
oblate sphere
oblate spheriod

oblique angle
oblique axis
oblique cone
oblique conoid
oblique coordinates
oblique cylinder
oblique drawing
oblique elliptical cylinder
oblique graphical presentation
oblique helicoid
oblique illumination system
oblique joint
oblique line
oblique pentagonal prism
oblique perspective
oblique plane
oblique position
oblique prism
oblique projection
oblique pyramid
oblique rectangular parallelopiped
oblique rectangular prism
oblique section
oblique straight line
oblique stroke
oblique surface
oblique view

observed data
observed point

ocular estimate
ocular estimation

odd curve
odd number
odd proportion

office lettering
office method

offset
offset angle
offset construction
offset dimension
offset lithography（camera work）
offset lithography（press work）
offset method
offset printing
offset section
offset [cutting] plane

ogee arch
ogee curve

one hundred per cent bar chart
one hundred per cent circle chart
one-line diagram
one-plane method
one-plane projection
one-point perspective
one-stroke arrowhead
one-stroke letter

open belt
open curve
open divided scale
open division
open head
open-style arrowhead stroke

operation chart
operation illustration
operation process
operation sheet

opposite angle
opposite bevel scale
opposite direction
opposite hand view
opposite point
opposite side
opposite sides

optional construction
optional way

order
order of checking
order of dimensioning
order of drawing
order of inking
order of penciling
order of tracing

ordinate
ordinate dimensioning
ordinate method

orientation
orientation diagram
orientation tolerance

origin
origin of coordinates

original
original drawing
original idea
original rough-cast form

orthogonal
orthogonal axes
orthogonal projection

orthographic drawing
orthographic projection
orthographic sketch
orthographic view

out of roundness
out of square
out-of-scale dimension

outer diameter
outer most dimension
outer throat diameter

outline
outline assembly drawing
outline sectioning
outline sketch

outside angle
outside caliper
outside diameter
outside surface
outside view

oval
oval head
oval section

overall accumulation
overall diameter
overall dimension
overall height
overall length
overall spread
overall width

overlay
overlay sheet

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