[ˈpɪ.rũː], [ˈpiː.rum]
Origin* Per De Vaan a loanword from an unknown Mediterranean substrate source, original form something like (a)pisom reflected also in Ancient Greek ᾰ̓́πῐον (ắpĭon, “pear”) and ᾰ̓́πῐος (ắpĭos, “pear tree”). Also compare Aramaic 𐡐𐡀𐡓𐡀 (pera, “fruit”).
* Per Trubachyov ultimately from Proto-Indo-European *peys-, akin to Latin pinsō, pistus, Proto-Slavic *pьšeno (whence Russian пшено́ (pšenó)). Compare Proto-Slavic *kruša (voiced counterpart: *gruša, whence Russian гру́ша (grúša)) akin to *krušiti (> Russian круши́ть (krušítʹ)).
- declension-2, neutera pear (fruit)
Formspirī(genitive) · pirum(nominative, singular) · pira(nominative, plural) · pirī(genitive, singular) · pirōrum(genitive, plural) · pirō(dative, singular) · pirīs(dative, plural) · pirum(accusative, singular) · pira(accusative, plural) · pirō(ablative, singular) · pirīs(ablative, plural) · pirum(singular, vocative) · pira(plural, vocative) · pyrum(alternative, Medieval-Latin)
Source: Wiktionary