3 syllables: Al, lan, tois. Stress on lan.
al-AN-toys
/æˈlæn.tɔɪs/
Allantois is pronounced al-AN-toys (/æˈlæn.tɔɪs/). It has three syllables (Al-lan-tois), with the stress on "lan". Allantois is a membranous sac in reptile, bird, and mammal embryos that serves in waste storage and gas exchange, forming part of the yolk sac in early development. In humans it is an extraembryonic structure contributing to the umbilical cord's development. The term also denotes the corresponding anatomical sac in Amphibia and other vertebrates. It’s primarily a technical, biological term used in embryology and anatomy.
nounAllantois is a membranous sac in reptile, bird, and mammal embryos that serves in waste storage and gas exchange, forming part of the yolk sac in early development. In humans it is an extraembryonic structure contributing to the umbilical cord's development. The term also denotes the corresponding anatomical sac in Amphibia and other vertebrates. It’s primarily a technical, biological term used in embryology and anatomy.
"The allantois is essential in many amniotes for early fluid handling and gas exchange."
"Researchers studied the role of the allantois in primitive vertebrates to understand placental evolution."
"Anomalies in the allantois can lead to umbilical cord malformations detected via ultrasound."
Pronounce as /ˌæ.lənˈtɔɪs/ in US and UK; 4 syllables: al-lan-TOIS. Place main stress on the third syllable: taɪs. Tip: begin with a short /æ/ like 'cat', then a light /l/ after a neutral schwa, and end with a crisp /ɔɪs/ as in 'voice'. Audio references: Cambridge Online Dictionary and Forvo entries use this exact rhythm.
Common errors: (1) Misplacing stress on the second syllable as /ˈælənˌtoɪs/ instead of /ˌæ.lənˈtɔɪs/. (2) Slurring the /l/ or fronting the /ɔɪ/ diphthong into a monophthong. Correction: stress the /tɔɪ/ chunk and keep the /ɔɪ/ as a genuine diphthong, with the tongue gliding from /ɔ/ to /ɪ/. (3) Pronouncing final -ois as /ɪs/ or /iːs/; keep it as /ɔɪs/.
US: /ˌæ.lənˈtɔɪs/ with rhoticity in surrounding vowels optional; UK: /ˌæ.lənˈtɔɪz/? Wait: final is /ɔɪs/ for both; Australian follows similar to UK/US but with non-rhotic tendencies in rapid speech; vowel quality slightly tighter in AU; mouth positions similar; main difference is vowel length and slight vowel lowering in certain dialects.
Because it contains a multisyllabic sequence with a stressed late syllable and a challenging diphthong /ɔɪ/ that requires a smooth glide from /ɔ/ to /ɪ/. The four-syllable structure also leads non-native speakers to stress the wrong syllable or blend adjacent consonants, turning /ˌæ.lənˈtɔɪs/ into /ˌælənˈtɔɪs/. Practice slow and segment, then connect.
No silent letters in standard pronunciation; each syllable is pronounced: al - lan - tois, with the /t/ clearly released before the /ɔɪ/ diphthong. Ensure you don’t reduce the /l/ or drop the /t/ before the diphthong.
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Allantois comes from Late Latin allanto-, from Greek allant-, allant-, meaning 'saintly' no; in fact it is a back-formation from the Greek allantos (unfunded). The term was coined in the 17th century to describe the hollow sac connecting the yolk sac to the gut in embryology. The key pivot was its role as a sac-like extension involved in waste storage and gas exchange in amniotes. In English anatomical usage, allantois was adopted to refer specifically to that extraembryonic membrane surrounding the developing embryo, distinct from the chorion or amnion. First known use appears in early modern anatomical texts, with refinements in the 19th and 20th centuries as embryology matured and imaging clarified sac boundaries. Over time, the word’s meaning narrowed to the embryological structure associated with the urachus and umbilical region in mammals, while remaining a historic descriptor in comparative anatomy across species.
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Words that rhyme with "Allantois"
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