It can be (hissing snakes, hissing cats). It is the present participle of the verb to hiss, and is otherwise a verb form or a noun (gerund).
yes it is a verb
making a hissing noise
during the Middle ages people hissed, but what was the reason and meaning of this?
No, it is a verb or a noun (to go around, to surround; a round shape). The adjective form is circular.
No, it is not an adjective. Differently is an adverb.The adjective would be different.
According to the Oxford English dictionary is a noun meaning a hissing but also an adjective meaning very hot; very striking
Madagascan hissing cockroaches make a noise by forcing air out of a special hole.
It got its name by hissing and they fight too.
Madagascar Hissing Cockroaches
Geese make a hissing sound.
Most likely, the hissing repels predators long enough for the hissing cockroach to escape and breed, thus passing the genes that contribute to hissing biology on to another generation.
It might be hissing due to the bareings going out in it.
The Clue of the Hissing Serpent was created in 1974.
Madagascar hissing cockroach was created in 1853.
Just imagine my surprise when the giant cockroach began hissing at me! The uproarious audience immediately began hissing and booing the villain when he appeared onstage.
That's not a snake, it's my tire that's hissing.
The Clue of the Hissing Serpent has 181 pages.