amnion

am·ni·on

noun \ˈam-nē-ˌän, -ən\

plural amnions or am·nia\-nē-ə\

Definition of AMNION

1

: a thin membrane forming a closed sac about the embryos or fetuses of reptiles, birds, and mammals and containing the amniotic fluid

2

: a membrane analogous to the amnion and occurring in various invertebrates

— am·ni·ot·ic \ˌam-nē-ˈä-tik\ adjective

Origin of AMNION

New Latin, from Greek, caul, from amnos lamb — more at yean

First Known Use: 1667

Rhymes with AMNION

Abadan, Acheron, Ahriman, aileron, alençon, amazon, Amazon, and so on, antiphon, Aragon, autobahn, balmacaan, Bantustan, baryon, Basilan, bear down on, beat up on, betatron, biathlon, cabochon, call upon, calutron, carillon, carry-on, carry on, celadon, check up on, chorion, colophon, come upon, Culiacán, cyclotron, decagon, decathlon, demijohn, dine out on, early on, echelon, electron, elevon, enteron, epsilon, ethephon, etymon, fall back on, fermion, follow-on, Genghis Khan, get it on, go back on, going on, goings-on, gonfalon, Grand Teton, graviton, hanger-on, harijan, helicon, heptagon, hereupon, hexagon, hold out on, hopping John, Huascarán, hyperon, Isfahan, isochron, Kublai Khan, Kyrgyzstan, lay eyes on, Lebanon, leprechaun, liaison, Lipizzan, load up on, logion, looker-on, macédoine, marathon, Marathon, marzipan, mastodon, Mazatlán, Miquelon, miss out on, morion, move in on, myrmidon, nonagon, noumenon, nucleon, Oberon, octagon, off and on, omicron, Oregon, organon, ostracon, Pakistan, Palawan, pantheon, paragon, Parmesan, parmigiana, Parthenon, peloton, pentagon, pentathlon, Percheron, Phlegethon, Phocion, pick up on, polygon, positron, Procyon, put-upon, Rajasthan, Ramadan, ride herd on, run low on, run out on, run upon, set eyes on, set foot on, set upon, silicon, sneak up on, Süleyman, tachyon, Taiyuan, talkathon, telamon, telethon, thereupon, tie one on, triathlon, Tucumán, upsilon, virion, walkathon, walk out on, whereupon, woebegone, work upon, Yerevan, Xiangtan, Zahedan

am·ni·on

noun \ˈam-nē-ˌän, -ən\   (Medical Dictionary)

plural ; amnionsor ; am·nia \-nē-ə\ (audio pronunciation)

Medical Definition of AMNION

: a thin membrane forming a closed sac about the embryos and fetuses of reptiles, birds, and mammals and containing the amniotic fluid—called also amniotic sac