SPIRANT n.
n, by others, of the liquids r, l, and the semivowels w, y; by others limited to f, v, th surd and sonant, and the sound of German ch, -- thus excluding the sibilants, as well as the nasals, liquids, and semivowels. See Guide to Pronunciation, §§ 197-208.
TENUIS n.
One of the three surd mutes k, p, t; -- so called in relation to their respective middle letters, or medials, g, b, d, and their aspirates, x, f, th. The term is also applied to the corresponding letters and articulate elements in other languages.
VOICELESS a.
Not sounded with voice; as, a voiceless consonant; surd. Voiceless stop (Phon.), a consonant made with no audible sound except in the transition to or from another sound; a surd mute, as p, t, k. -- Voice"less*ly, adv. -- Voice"less*ness, n.