острица

• IPA^(key): [oˈstrit͡sə]

Блатна острица (Carex riparia)

From Proto-Slavic *ostrica, *ostrika. Equivalent to о́стър (óstǎr, “sharp”) +‎ -ица (-ica).

остри́ца • (ostríca) f

1. sedge (graminoid flowering plant from family Cyperaceae, known for its sharp leaves)

   Synonym: бодли́ва трева́ (bodlíva trevá)

2. (particularly) true sedge of genus Carex

   Synonym: (dialectal) къ́ндра (kǎ́ndra)

• остри́ка (ostríka), остри́га (ostríga) – dialectal

• остре́ц (ostréc), острие́ (ostrié, “blade”)

• острица¹ in Rečnik na bǎlgarskija ezik (Institut za bǎlgarski ezik)
• Georgiev V. I., Duridanov I., editor (1995), “острица”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (in Bulgarian), volume 4, Sofia: Bulgarian Academy of Sciences, page 948
• Nayden Gerov (1899), “остри́ка (1)”, in Рѣчникъ на Блъгарскꙑй язꙑкъ. Съ тлъкувание рѣчи-тꙑ на Блъгарскꙑ и на Русскꙑ. [Dictionary of the Bulgarian language] (in Bulgarian), volume 3, Plovdiv: Дружествена печꙗтница "Съгласие.", page 392

Риба острица

Probably diminutive of Proto-Slavic *ostь (“fishbone”) + -р- (-r-) +‎ -ица (-ica), similar to the standard word косту́р (kostúr) (from Bulgarian кост (kost, “bone”)). Named after its bony fins and spikes.

остри́ца • (ostríca) f

1. (dialectal) pinworm, threadworm, seatworm (parasitic round worm of genus Enterobius or more generally of family Oxyuridae)

   Synonyms: косту́р (kostúr), бодлопе́рка (bodlopérka)

• остри́ка (ostríka)

• острица³ in Rečnik na bǎlgarskija ezik (Institut za bǎlgarski ezik)
• Nayden Gerov (1899), “остри́ка (2)”, in Рѣчникъ на Блъгарскꙑй язꙑкъ. Съ тлъкувание рѣчи-тꙑ на Блъгарскꙑ и на Русскꙑ. [Dictionary of the Bulgarian language] (in Bulgarian), volume 3, Plovdiv: Дружествена печꙗтница "Съгласие.", page 392

Червей острица

Influenced by Russian остри́ца (ostríca, “pinworm”), probably a calque of the scientific name for the family Oxyuridae. Morphologically equivalent to Etymology 1.

остри́ца • (ostríca) f

1. pinworm (parasitic roundworm of genus Enterobius or more generally of family Oxyuridae)
2. (by extension) enterobiasis (disease caused by infection with pinworms)

• остри́к m (ostrík)

• острица² in Rečnik na bǎlgarskija ezik (Institut za bǎlgarski ezik)

• IPA^(key): [ˈɔstrit͡sa]

острица • (ostrica) f

1. blade

• IPA^(key): [ɐˈstrʲit͡sə]

остри́ца • (ostríca) f anim (genitive остри́цы, nominative plural остри́цы, genitive plural остри́ц)

1. pinworm