Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mīrātrix, īcis, f. [mirator], wondering, admiring; she that wonders or admires (poet.): miratrix turba, Juv. 4, 62: fama, Sen. Hippol. 742: vetustas sui, Luc. 4, 655