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The Collaborative International Dictionary
Tenuious

Tenuious \Te*nu"i*ous\, a. [See Tenuous.] Rare or subtile; tenuous; -- opposed to dense. [Obs.]
--Glanvill.

Douglas Harper's Etymology Dictionary
tenuious

late 15c., from Latin tenuis "thin" (see tenuous) + -ous.

Wiktionary
tenuious

a. (context obsolete English) rare or subtle; tenuous