From péist (“worm”) + -chruthach (“-shaped”).
péistchruthach (genitive singular masculine péistchruthaigh, genitive singular feminine péistchruthaí, plural péistchruthacha, comparative péistchruthaí)
| Singular | Plural (m/f) | |||
|---|---|---|---|---|
| Positive | Masculine | Feminine | (strong noun) | (weak noun) |
| Nominative | péistchruthach | phéistchruthach | péistchruthacha; phéistchruthacha² | |
| Vocative | phéistchruthaigh | péistchruthacha | ||
| Genitive | péistchruthaí | péistchruthacha | péistchruthach | |
| Dative | péistchruthach; phéistchruthach¹ |
phéistchruthach; phéistchruthaigh (archaic) |
péistchruthacha; phéistchruthacha² | |
| Comparative | níos péistchruthaí | |||
| Superlative | is péistchruthaí | |||
¹ When the preceding noun is lenited and governed by the definite article.
² When the preceding noun ends in a slender consonant.
| Irish mutation | ||
|---|---|---|
| Radical | Lenition | Eclipsis |
| péistchruthach | phéistchruthach | bpéistchruthach |
| Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs. | ||