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allantois Definition

al·lan·tois (ə lan′tō is)

noun pl. allantoides al′·lan·to′i·des′ (al′ən tō′ə dēz′)

a membranous pouch with a rich blood supply in the embryos of birds, reptiles, and mammals: it is an organ of respiration and excretion for embryonic birds and reptiles: in mammals it helps form the placenta

Etymology: ModL < Gr allantoeidēs, sausage-shaped < allas, sausage (prob. < dial. allē, garlic, via Oscan *allo < L alium, allium) + -eidēs, -oid

Browse dictionary entries near allantois

  1. ‹ allantoides
  2. ‹ allantoid
  3. ‹ allantoic
  4. ‹ Allan
  5. ‹ Allahabad
  6. ‹ Allah
  7. ‹ alla carbonara
  8. ‹ alla breve
  9. ‹ all told
  10. ‹ all-time
  1. allargando ›
  2. allay ›
  3. allayed ›
  4. allayer ›
  5. allaying ›
  6. allegation ›
  7. allege ›
  8. allegeable ›
  9. alleged ›
  10. allegedly ›