Definition of zeroth in English:

zeroth

Line breaks: zer¦oth
Pronunciation: /ˈzɪərəʊθ
 
/

adjective

Immediately preceding what is regarded as first in a series.

Origin

late 19th century: from zero + -th1.

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Word of the day punctum
Pronunciation: ˈpʌŋ(k)təm
noun
a small, distinct point