also: にっせい
noun
entering tone (Chinese phonology)
Technical term in Chinese historical phonology referring to a tone category of syllables ending in a stop consonant (p, t, k). Used in discussions of Middle Chinese and its influence on Sino-Japanese readings.
入声は中古中国語の四声の一つで、内破音で終わる音節を指す。
The entering tone is one of the four tones of Middle Chinese, referring to syllables ending in a stop consonant.
日本語の漢字音では、入声は「〜ツ」「〜チ」「〜フ」などの形で
In Sino-Japanese readings, the entering tone remains in forms such as -tsu, -chi, and -fu.
From Middle Chinese 入聲 (nyip syeng, 'entering tone'). The reading にっしょう is the regular Sino-Japanese go-on reading; にっせい is a variant.