pьstrǫgъ (Proto-Slavic) comes from Proto-Slavic pьstrъ, from Proto-Slavic pьsrъ, from Proto-Balto-Slavic piśras, from Proto-Indo-European piḱrós, from Proto-Indo-European peyḱ- — to hew, cut out; to stitch, embroider, sting; to...