vratati | व्रतति | vratati

vrata/ti | व्रत/ति | f. (prob. fr. √ vft | व्फ़्त् |) a creeping plant, creeper, RV. &c. &c. (also ˚tī | ˚ती |)

expansion, extension, spreading (= pra-tatī | प्र-तती |), L.