佛說十八泥犁經. 니리泥犁. 니라야. 나라카. 나락奈落. 지옥

ないり ［1］ 【泥▽ 犂▼・泥▽ 梨▽】 〔梵 niraya〕
〘仏〙 地獄。奈落（ならく）。

【泥犁】

（界名）梵語，地獄也。其義為無有，謂喜樂之類一切皆無。為十界中最劣境界，亦作泥黎，或作泥梨迦。捫虱新話曰：黃魯直初好作豔歌小詞，道人法秀謂其以筆墨誨淫，於我法中，當墜泥犁之獄。魯直自是不作。佛書泥梨耶，無喜樂也。泥梨迦，無去處也。二者皆地獄名。或省耶迦字，只作泥梨，一作犁。又阿鼻，無間也，亦地獄名。法華經：無間地獄，有頂天堂。

Naraka (Sanskrit: नरक; Pali: निरय Niraya) is a term in Buddhist cosmology[1] usually referred to in English as "hell" (or "hell realm") or "purgatory". The Narakas of Buddhism are closely related to diyu, the hell in Chinese mythology. A Naraka differs from the hell of Christianity in two respects: firstly, beings are not sent to Naraka as the result of a divine judgment or punishment; and secondly, the length of a being's stay in a Naraka is not eternal, though it is usually incomprehensibly long, from hundreds of millions to quintillions (1018) of years.[2]

A being is born into a Naraka as a direct result of his or her accumulated actions (karma) and resides there for a finite period of time until that karma has achieved its full result.[3] After his or her karma is used up, he or she will be reborn in one of the higher worlds as the result of karma that had not yet ripened.

In the Devaduta Sutta, the 130th discourse of Majjhima Nikaya, the Buddha teaches about hell in vivid detail.

Physically, Narakas are thought of as a series of cavernous layers which extend below Jambudvīpa (the ordinary human world) into the earth. There are several schemes for enumerating these Narakas and describing their torments. The Abhidharma-kosa (Treasure House of Higher Knowledge) is the root text that describes the most common scheme, as the Eight Cold Narakas and Eight Hot Narakas.[4]