Aspirata

Aspiratae are, besides the tenues and the mediae , types of the ancient Greek consonants. The aspiratae (lat. "Breathed") are emphasized and spoken aspirated. In the Latin transcription they were always adopted with an additional H (e.g. Greek θ as th ). These include the Dental Theta , the Labial Phi and the Guttural Chi . Gutturals and labials change their tone form before an aspirata to an aspirata, so pi before theta becomes phi (π + θ <φθ).

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Wiktionary: Aspirata  - explanations of meanings, word origins, synonyms, translations