Nouns of two plural forms

Some masculine nouns, inherited from the Latin neuter class of the 2nd declension (sg. -um : pl. -a), have two plural forms: one in -i (masculine) and another in -a (feminine). Their meaning may be radically different.

In general, the plural masculine form ending in -i is used figuratively, while the form in -a is used in a more concrete sense. Sometimes, both forms can be used interchangeably.

The following is a short list of such nouns:
 

  Masculine Noun in Singular   Masculine Plural in -i   Feminine Plural in -a
                 
  anèllo (lo) ring   anèlli (gli) rings
Gli anelli di Saturno
  anèlla (le) curly hairs (literary)
  bràccio (il) arm   bracci (i) wings, branches,
arms
I bracci della sedia
  bràccia (le) arms of human body
  budèllo (il) alley, intestine   budèlli (i) alleys   budèlla (le) guts
  calcagno (il) heel   calcagni (i) heels   calcagna (le) (idiomatic, figurative):
stare alle calcagna di qualcuno
  cervèllo (il) brain   cervèlli (i) brains   cervèlla (le) (idiomatic):
farsi saltare le cervella
  cìglio (il) eyelash,
curb
  cigli (i) curbs
edges
  cìglia (le) eyelashes
  còrno (il) horn   còrni (i) horns (music.);
(also idiomatic):

I corni del problema
  còrna (le) horns:
le corna del cervo
  cuòio (il) leather   cuòi (i) type of leather   cuòia (le) (idiomatic):
tirare le cuoia
  dito (il) finger   diti (i) fingers (considered individually)   dita (le) fingers (collectively)
  filaménto (il) filament   filaménti (i) filaments   filaménta (le) (literary) filaments
  filo (il) thread   fili (i) threads   fila (le) thread (fig.):
tirare le fila"
  fondaménto (il) foundation, basic notion   fondaménti (i) basic notions   fondaménta (le) foundations
  fuso (il) spindle   fusi (i) spindles   fusa (le) (idiomatic):
Il gatto fa le fusa
  gèsto (il) gesture   gèsti (i) gestures   gèsta (le) deeds, feats
  ginòcchio (il) knee   ginòcchi (i) knees   ginòcchia (le) knees (used collectively)
  grido (il) scream   gridi (i) screams   grida (le) screams
  labbro (il) lip, edge   labbri (i) edges   labbra (le) lips
  lenzuòlo (il) sheet   lenzuòli (i) sheets   lenzuòla (le) sheets (used collectively)
  mèmbro (il) limb, member   mèmbri (i) members   mèmbra (le) limbs
  muro (il) wall   muri (i) walls   mura (le) city walls
  òsso (lo) bone   òssi (gli) animal bones   òssa (le) human bones
  sopraccìglio (il) eyebrow   sopraccigli (i) eyebrows   sopraccìglia (le) eyebrows (collectively)
  strido (lo) squeak   stridi (gli) squeaks (less common)   strida (le) squeaks
  urlo (lo) shout   urli (gli) shouts   urla (le) shouts

   


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