Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
plait [plæt] n (of hair) коса́#
vt (hair) заплета́ть (заплести́*perf) (rope) плести́*(сплести́*perf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.