Biduous is a rare adjective meaning lasting or continuing for two days.
Plain meaning
A biduous event occupies two days, whether or not it lasts exactly forty-eight elapsed hours.
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The word is formal and uncommon. In ordinary writing, two-day is usually clearer.
Possible subjects
A ceremony, conference, journey, bloom, experiment, observation period, or ritual can be described as biduous.
Frequently asked questions
What does biduous mean?
It means lasting or continuing for two days.
Is biduous a real word?
Yes. It is a rare historical English adjective with Latin roots.
How is it pronounced?
Approximately BID-yoo-us.
Is it the same as dubious?
No. Dubious means doubtful.
Does it always mean forty-eight hours?
No. It can refer to two calendar days.
Can it describe a flower?
Yes. Older dictionary evidence uses it for flowers lasting two days.
Is it common today?
No. Two-day is much more common.
Should it be defined for readers?
Yes, especially outside historical or specialist writing.