The Collaborative International Dictionary of English v.0.48:

Spumous \Spum"ous\ (sp[=u]m"[u^]s), Spumy \Spum"y\
   (sp[=u]m"[y^]), a. [L. spumosus, fr. spuma foam: cf. F.
   spumeux.]
   Consisting of, containing, or covered with, froth, scum, or
   foam; frothy; foamy.
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         The spumous and florid state of the blood. --Arbuthnot.
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         The spumy waves proclaim the watery war. --Dryden.
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