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
- ‹ allantoid
- ‹ allantoic
- ‹ Allan
- ‹ Allahabad
- ‹ Allah
- ‹ alla breve
- ‹ all told
- ‹ all-time
- ‹ all-star
- ‹ All Souls' Day
- allargando ›
- allay ›
- allegation ›
- allege ›
- alleged ›
- allegedly ›
- Allegheny ›
- Allegheny Mountains ›
- allegiance ›
- allegorical ›

