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).
making a hissing noise
during the Middle ages people hissed, but what was the reason and meaning of this?
The noun 'is' is a verb, a form of the verb 'to be'. The verb 'is' functions as an auxiliary verb and a linking verb.
It is an action verb.
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
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.
The snake hissed loudly as a warning to stay away.
That's not a snake, it's my tire that's hissing.