How to say "bore" in Japanese

• 口径こうけいCommon
  nounCovers the physical 'bore' of a gun barrel or pipe as its aperture or calibre. Use this when the bore is being measured or stated as a specification, as in firearms or optics.
• 内径ないけいCommon
  nounAlso refers to the bore of a tube, cylinder or bearing, but with the nuance of 'inside diameter' as opposed to the outer diameter. It is a purely technical term and never covers the verb 'to bore' or the sense of being boring.

For the technical sense of 'bore' as the inside diameter of a tube or barrel, use 口径 for calibre/aperture generally, and 内径 when stressing the inside diameter specifically.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 口径こうけいaperture
• 内径ないけいbore
• えぐるto gouge
• 飽かすあかすto bore
• 飽かせるあかせるto bore
• 穿つうがつto drill
• くり抜くくりぬくto gouge out
• 鼻つまみはなつまみuncouth person
• ボア(tidal) bore
• 海嘯かいしょう(tidal) bore
• 邪魔者じゃまものnuisance