tenuis

Etymology
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Adjective

 * 1)  Of Greek consonants, neither aspirated nor voiced, as [p], [t], [k]
 * 2)  Of obstruents in other languages, not voiced, aspirated, glottalized, or otherwise different in phonation from the prototypical values of the voiceless IPA letters ([p], [t], [k], [f], [θ], [s], [ʃ], etc.).

Noun

 * 1)  A tenuis consonant.

Etymology
.  Original u-stem adjective are regularly extended into i-stem ones in Latin, compare, , , etc.

Adjective

 * 1) thin, fine, slender
 * 2) weak, feeble, tenuous
 * 3) slight, trifling
 * 4) delicate, subtle, watery
 * 5)  phantom
 * 1) delicate, subtle, watery
 * 2)  phantom