spate /speɪt/, sb. orig. Sc. and north. Forms: ɑ. 5- spate, 5-9 spait, 6-7, 9 dial. spaitt, 6-7 spat, 7 spaite, 9 spaight. β. 6-7 speate, 7-9 speat, 9 dial. speatt, speeat, speet, spete, spyet, etc.
Etymology: Of obscure origin: the early spelling and rimes show that the original vowel was ā, the later change of which to ea, etc., is regular.
1 A flood or inundation; esp. a sudden flood or rising in a river or stream caused by heavy rains or melting snow.
ɑ
C. 1425 Wyntoun Cron. i. vii[i.] heading, - The ark and the spate of Noe.