Meaning of the Sanskrit Word: sarmisthaya

  śarmiṣṭhayā—by Śarmiṣṭhā    SB 9.18.24
  śarmiṣṭhayā—Śarmiṣṭhā, the daughter of Vṛṣaparvā and servant of Devayānī    SB 9.18.30

Can't find any compound Sanskrit words containing sarmisthaya.