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oestrogen

noun

oestrogen is a noun meaning “Alternative spelling of estrogen” (English Wiktionary, September 2026). It is spelled O-E-S-T-R-O-G-E-N, and it appears about once in every 4 million words in written English (wordfreq, 2021 data). The plural of oestrogen is oestrogens.

What does oestrogen mean?

noun

  1. 1

    CommonwealthAlternative spelling of estrogen.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

Forms of oestrogen

  • oestrogens plural

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

How common is oestrogen?

Oestrogen appears about once in every 4 million words in written English, the 59,387th most frequent word form in the list.

Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).

Words people confuse with oestrogen

Word pairs people search, with the monthly searches for “a vs b” (G: Google, B: Bing, United States).

estrogen vs oestrogen140 G

Also written: estrogen.

Sources: Google and Bing searches (September 2025 to August 2026, through DataForSEO); English Wiktionary (homophones, alternative spellings).