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allantois Definition

al·lan·tois (ə lan′tō is)

noun pl. 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. ‹ allantoid
  2. ‹ allantoic
  3. ‹ Allan
  4. ‹ Allahabad
  5. ‹ Allah
  6. ‹ alla breve
  7. ‹ all told
  8. ‹ all-time
  9. ‹ all-star
  10. ‹ All Souls' Day
  1. allargando ›
  2. allay ›
  3. allegation ›
  4. allege ›
  5. alleged ›
  6. allegedly ›
  7. Allegheny ›
  8. Allegheny Mountains ›
  9. allegiance ›
  10. allegorical ›