парен

By surface analysis, па́ра (pára, “steam”) +‎ -ен (-en).

• IPA^(key):

па́рен • (páren)

1. (relational) steamy

   парен двигател ― paren dvigatel ― steam engine

   парна ютия ― parna jutija ― steam iron

• па́рно (párno, “central heating”)
• па́рник (párnik, “hothouse”)

• “парен¹”, in Речник на българския език (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
• “парен”, in Речник на българския език (in Bulgarian), Chitanka, 2010

Deverbal from па́ря (párja, “to scald”), related to Etymology 1.

• IPA^(key):

парен • (paren)

1. masculine singular adjectival participle of па́ря (párja): scalded, burnt

   Парен каша духа. (proverb)

   Paren kaša duha.

   Once bitten twice shy.

   (literally, “One who has been scalded blows porridge.”)

• изпаре́н (izparén)
• запа́рен (zapáren)
• напа́рен (napáren)
• попа́рен (popáren)
• спа́рен (spáren)

• “парен²”, in Речник на българския език (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014

Ultimately from Latin pār (“alike”) + -ен (-en), probably via German Paar (“pair”). Cognate with Russian па́рный (párnyj).

• IPA^(key):

па́рен • (páren) (adverb па́рно) (obsolete)

1. on par, even
2. (by extension) neat, orderly

The adjective itself has mostly gone out of use, but its corresponding adverb is still attested in dialects and can be found in older literature.

• Стефан Илчев (1974): “парно” (нареч.) in Речник на редки, остарели и диалектни думи в литературата ни от XIX и XX век (in Bulgarian), стр. 338

• панер (paner), пране (prane), перна (perna)

• IPA^(key):

парен • (paren) (not comparable)

1. even (of numbers)

парен • (paren) (not comparable)

1. (relational) steam

парен • (paren)

1. masculine singular adjectival participle of пари (pari)