What sound does ch make in a Greek origin?

In Greek origin, the letter combination "ch" often represents a sound similar to the "k" sound in English, especially when it appears before the letters "e" or "i." However, in certain contexts, such as with the Greek letter "χ" (chi), it can also produce a voiceless fricative sound, akin to the "h" in "loch" or the "ch" in German "Bach." This phonetic distinction can vary depending on the specific Greek Word and its transliteration into English.