Where does this definition of test-tube come from?
This entry for test-tube is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is test-tube a noun, verb, or something else?
In this entry, test-tube is tagged as adj..
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.