amni-

DEFINITION of amni-

fetal membrane, amniotic sac, amnion

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ETYMOLOGY of amni-

greek

Component	Origin	Meaning
amni- / amnio-	Greek ἀμνίον (amnion), from amnion (amnion)	“amnion,” “membrane,” “membrane surrounding the fetus”

The word entered English in the 1640s as amnion (noun), borrowed from Late Latin amnion, from Greek amnion — literally “membrane.” The root amnion (“membrane”) connects amni- to the entire embryonic membranes: amniocentesis (amni- + kentein $\to$ puncture of the amnion), amniotomy (amni- + tome $\to$ incision into the amnion), and amniotic (pertaining to the amnion). The combining form amni- is highly productive in obstetrics and embryology: e.g., amniochoreosis, amniopathy, and amniochorion.

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RELATED TERMS to amni-

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DERIVATIONS of amni-

TABLE definition AS Definition 
WHERE length(filter(roots, (word) => econtains([[]].roots, word))) > 0 AND file.name != [[]].file.name
SORT file.name ASC

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Query

TABLE definition AS Definition
FROM #medroot
WHERE length(filter(definition, (word) => econtains([[]].definition, word))) > 0 AND file.name != [[]].file.name

Med terms dictionary

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Combining Form: amni-

Short Definition

Relating to the amniotic sac.

Long Definition

The combining form amni- refers to the amnion, the thin membrane surrounding the fetus. It appears in obstetrics, prenatal care, and fetal diagnostic terminology.

Etymology

• Greek amnion → “membrane around a fetus”

Related Terms

Term	Meaning
embry-	embryo
fet-	fetus

Common Medical Terms

• Amniocentesis - sampling of amniotic fluid
• Amnionitis - inflammation of the amniotic sac
• Amniotic fluid - protective fetal fluid

Documentation Clues

• “Rupture of membranes”
• “Amniotic fluid index”
• “Chorioamnionitis”

Coder’s Notes

OB coding requires timing, complications, and maternal vs. fetal distinctions.