(1) A consonant produced without sound from the vocal cords
(1) Produced without vibration of the vocal cords
(1) I don't care about rationalising denominators with surds in them, and I don't care that by using maths induction you can prove many equations to be right or wrong.
(2) They were learning about surds in maths, supposedly one of the hardest subjects.
(3) In the conventional school education in India, we are asked to do some problems involving surds (radicals).
unvoiced
voiceless
hard
voiceless consonant