pyralid /pʌɪˈɹalɪd/adjective 1noun 1forms 3 adjective1 •Pertaining to the Pyralidae family of moths.They are often tiny, frequently brown and always challenging to identify but an average of one new species of pyralid moth each year is turning up in Britain, according to experts. — 2018 noun1 •A moth of the family Pyralidae. formspyralids · more pyralid · most pyralid