17 matches in 2 dictionaries.
Details
invisible to the naked eye
USA: ɪ"nvɪ'zʌ·bʌ·l tʌ· ðiː· neɪ'kʌ·d aɪ' UK: ɪnvɪzəbl tuː ðiː neɪkɪd aɪ

perceptible to the naked eye
USA: pəː·se'ptʌ·bʌ·l tʌ· ðiː· neɪ'kʌ·d aɪ' UK: pəseptəbl tuː ðiː neɪkɪd aɪ

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