The adjective "helical" is pronounced phonetically as HEL-i-kəl (IPA: /ˈhɛlɪkəl/). It is accented strongly on the first syllable ("hel"), followed by a short "i" sound, and ending with a soft schwa sound combined with an "l" consonant. This pronunciation applies consistently across American, British, and international English dictionaries for both scientific and everyday speech.
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