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n. The 19th letter of the Greek alphabet. See Table at alphabet.

n. An elementary particle of the lepton family, having a mass about 3,550 times that of the electron, a negative electric charge, and a mean lifetime of 3 × 10-13 seconds. See Table at subatomic particle.

n. The name of the letter T/τ in the Greek, Hebrew and ancient Semitic alphabets, being the nineteenth letter of the Classical and Modern Greek, the twentieth letter of Old and Ancient Greek.

n. A Τ-shaped sign or structure; a St. Anthony's cross, sometimes considered as a sacred symbol.

n. A tau meson, now usually known as a kaon.

n. An unstable heavy lepton, which decays into a muon or electron; a tauon.

n. A type of protein used to stabilise microtubules.

n. The nineteenth letter (Τ, τ) of the Greek alphabet, equivalent to English t.

n. The common American toadfish; -- so called from a marking resembling the Greek letter tau (τ).

n. In ichthyology, the toadfish, Batrachus tau.

n. In entomology: A beetle.

n. A phalænid moth.

n. A fly.

n. In heraldry, same as tau-cross.

n. the 19th letter of the Greek alphabet

"Alzheimer's is marked by deposits of beta-amyloid protein in the brain, and knotty protein structures in the nerves themselves called tau tangles."

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