Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† brasmătĭae (access. form bras-tae, App. de Mundo, p. 65, 25), ārum, f., = οἱ βρασματίαι (sc. ἄνεμοι) or βράσται, a shaking of the earth, an earthquake: brasmatiae sunt (terrarum motus), qui terram molestius suscitantes sursum propellunt immanissimas moles, ut in Asiā Delos emersit, etc., Amm. 17, 7, 13.