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Envelopment in Irish (Forfhilleadh): Meaning, Pronunciation, Usage

‘forfhilleadh’ also means: envelope

The Irish for envelopment is forfhilleadh, a masculine noun (plural forfhillteacha).
Updated October 2026Report a mistake

How to say “envelopment” in Irish

Irish:
forfhilleadh
English:
envelopment, envelope
Word type:
noun (verbal noun)
Gender:
masculine
Pronunciation:
“FOR-il-uh”  /ˈfɔɾˠɪlʲə/
Various forms
Plural:
forfhillteacha (envelopments)
Genitive singular:
forfhillidh, an fhorfhillidh (e.g. cothromóid an fhorfhillidh, the equation of the envelopment)
Genitive plural:
forfhillteacha, na bhforfhillteacha (e.g. airíonna na bhforfhillteacha, the properties of the envelopes)

What does “forfhilleadh” mean?

“Forfhilleadh” has two alternative meanings. The most common comes first.

envelopment
The act of enveloping or wrapping something completely; the verbal noun of the verb forfhill.Also: enveloping, wrapping, enfolding.
1 other meaning: envelope
2envelope
In mathematics, a curve or surface that touches every member of a family of curves or surfaces.Also: envelope of curves, enveloping curve.

“Forfhilleadh” with the article

The plural of envelopment in Irish is forfhillteacha. Here is forfhilleadh after the article (an t-alt), in the singular and the plural.

an forfhilleadh
the envelopment
No change after an
na forfhillteacha
the envelopments
Plural: no change after na

“Forfhilleadh” in a sentence: Irish examples

Common Irish sentences using forfhilleadh, the Irish word for envelopment.

Is cuar é an forfhilleadh.
The envelope is a curve.
Fuair na mic léinn cothromóid an fhorfhillidh.
The students found the equation of the envelope.
Tá dhá fhorfhilleadh ag an teaghlach cuar seo.
This family of curves has two envelopes.
Rinneamar staidéar ar fhorfhillteacha sa rang inné.
We studied envelopes in class yesterday.
Tarraing an forfhilleadh ar an ngraf.
Draw the envelope on the graph.
Rinne an namhaid forfhilleadh ar an arm sa ghleann.
The enemy carried out an envelopment of the army in the valley.
Míníonn an leabhar forfhilleadh go soiléir.
The book explains envelopes clearly.

Other nouns in Irish

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Envelopment in Irish: frequently asked questions

What is the Irish for envelopment?

The Irish for envelopment is forfhilleadh (pronounced “FOR-il-uh”). It’s a masculine noun and the plural is forfhillteacha. Depending on context it can also mean envelope.

How do you pronounce forfhilleadh in Irish?

Forfhilleadh is said like “FOR-il-uh” (IPA /ˈfɔɾˠɪlʲə/).

What is the plural of envelopment in Irish?

The plural of forfhilleadh is forfhillteacha; with the article, na forfhillteacha means “the envelopments”. The genitive plural is forfhillteacha, as in airíonna na bhforfhillteacha (the properties of the envelopes).

Does forfhilleadh have more than one meaning?

Yes. Forfhilleadh can mean envelopment or envelope, depending on context; the first is the most common.

Why does forfhilleadh change to fhorfhilleadh or bhforfhilleadh?

Irish changes the start of some words after certain words. After mo (my) forfhilleadh becomes m'fhorfhilleadh (lenition), and after ár (our) or i (in) it becomes ár bhforfhilleadh (eclipsis).

Is forfhilleadh the word for a letter envelope?

No. A postal envelope is clúdach litreach; forfhilleadh is the mathematical envelope or the act of enveloping.

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