Where does this definition of extension tube come from?
This entry for extension tube is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is extension tube a noun, verb, or something else?
In this entry, extension tube is tagged as 2n..
Does extension tube appear elsewhere on Lughet?
Yes — extension tube appears under other sources or language pairs in Lughet's collection. See the list below.
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.