noun
Specifically refers to the low, rumbling sound a cat makes when content.
猫が膝の上で喉鳴らしをしている。
The cat is purring on my lap.
あの猫の喉鳴らしはとても大きい。
That cat's purring is very loud.
Onomatopoeia for a cat's purring sound, while 喉鳴らし is the noun for the act of purring.
Compound of 喉 (のど, 'throat') and 鳴らし (ならし, the noun form of 鳴らす 'to make sound'). Literally 'throat-sounding'.