Where does this definition of teaching aid come from?
This entry for teaching aid is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is teaching aid a noun, verb, or something else?
In this entry, teaching aid is tagged as 2n..
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.