diatom

n any of various types of microscopic one-cell plants living in water and forming fossil deposits 硅藻.

dialog, dialogue, dialogue (US also dialog), dialysis, diamante, diameter, diametre, diametrical, diametrically, diamond, diamond jubilee, diamond wedding, diaper, diaphanous, diaphragm, diarist, diarrhoea (US diarrhea), diary, Diaspora, diastase, diatonic, diatribe, dibble, dice, dicey, dichotomous, dichotomy, dick, dickens, Dickensian, dicker, dicky, dicky (also dickey), dicky-bird, dicotyledon, Dictaphone, dictate, dictation, dictator, dictatorial,