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The Collaborative International Dictionary
Spial

Spial \Spi"al\, n. A spy; a scout. [Obs.]
--Bacon.

Wiktionary
spial

alt. 1 (context obsolete English) espionage. 2 (context obsolete English) A spy. n. 1 (context obsolete English) espionage. 2 (context obsolete English) A spy.