Plural of beth; the second letter of the Hebrew alphabet, or a variant spelling of Bethesda or other places starting with Beth-.
From Hebrew 'beyt' meaning 'house,' which became the name of the second letter in the Hebrew alphabet. The plural form 'beths' is the standard English way to make this letter name countable when discussing multiple instances or varieties.
The Hebrew alphabet names are actual words—'aleph' means ox, 'beth' means house, 'gimel' means camel—so ancient scribes were literally learning the ABCs of practical objects. This shows how alphabets were memory devices for everyday things before becoming abstract symbols.
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