леща

Bulgarian Wikipedia has an article on:

Леща

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• IPA^(key):

Inherited from Proto-Slavic *lęťa, a wanderwort cognate with Latin lēns.

ле́ща • (léšta) f (relational adjective ле́щен or ле́щов)

1. (singular only) lentil plant (legume plant of genus Lens, most often of species Lens culinaris)
2. (uncountable, collective) lentil seeds
3. (by extension) soup/stew made of lentils

• ле́ча (léča), ле́кя (lékja) — with dialectal reflexes of proto-Slavic *-ť-

• леща́р m (leštár), леща́рица f (leštárica, “lentils seller/grower”)
• ле́щенка (léštenka), ле́щовина (léštovina, “type of weed”) (dialectal)
• ле́щница (léštnica, “epithet of smallpox”) (colloquial)

• водна леща (vodna lešta, “duckweed”) (litarally: “aquatic lentils”)

Bulgarian Wikipedia has an article on:

Леща (оптика)

Wikipedia ^bg

Calque of Arabic عَدْسَة (ʕadsa, “lentil; optic lens”).

ле́ща • (léšta) f

1. (physics, anatomy) lens

• конта́ктна ле́ща (kontáktna léšta, “contact lens”)

• “леща”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “леща”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010
• Nayden Gerov (1899) “лѧ́ща”, 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 39
• Georgiev, Vladimir I., editor (1986), “леща”, in Български етимологичен речник [Bulgarian Etymological Dictionary] (in Bulgarian), volume 3 (крес¹ – мѝнго¹), Sofia: Bulgarian Academy of Sciences Pubg. House, page 383

• IPA^(key):

леща́ • (leščá) m anim or m inan

1. inflection of лещ (lešč):
   1. genitive singular
   2. animate accusative singular