Proto-IE: *m[e]rǝ-
Meaning: to curdle, to harden
Old Indian: mūrchati `to become solid, thicken, congeal', ptc. mūrtá-; mū́rti- f. `solid body, embodiment, incarnation'
Old Greek: bróto-s m. etwa `das geronnene Blut'
Russ. meaning: свертываться, затвердевать
References: WP II 280