tau
/taʊ/noun
1- the nineteenth letter of the Greek alphabet (
T , τ), transliterated as 't'希腊字母表中第十九个字母（译写为t）。
1.1
Tau
followed by Latin genitive Astronomy the nineteenth star in a constellation【天文】τ星（星座中第十九颗星）：Tau Ceti.
鲸鱼座τ星。
1.2
- （全称tau particle 或tau lepton）Physics an unstable subatomic particle of the lepton class, with a charge of -1 and a mass roughly 3,500 times that of the electron【物理】τ粒子。
词源
Greek.