Englishfor English speakers
sonic
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adjective
relating to audible sound
a sonic wave
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adjective
(of speed) having or caused by speed approximately equal to that of sound in air at sea level
a sonic boom
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
hedgehog
Noun
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A hedgehog is a small insect-eating mammal, whose back is completely covered with short spines.
When a hedgehog feels in danger of being attacked, it rolls itself into a ball to protect his belly.