. ▁In ▁the ▁ 1 7 th - century ▁the ▁non - class ical ▁Latin ▁form ▁- ide us /- idea / ide um ▁for ▁Greek ▁- ε ι δ ή ς /- ε ι δ έ ς ▁came ▁into ▁use , ▁mostly ▁by ▁French ▁an atom ist ▁Jean ▁Ri olan ▁the ▁Young er . ▁No ▁Greek ▁loan words ▁( origin ally ▁- ε ι δ ή ς /- ε ι δ έ ς ) ▁ending ▁in ▁- ide us /- idea /- ide um ▁exist ▁in ▁classical ▁Latin , ▁thereby ▁making ▁the ▁- ide us /- idea /- ide um ▁form ▁non - Lat inate ▁in ▁character . ▁The ▁first ▁edition ▁of ▁the ▁J ena ▁Nom ina ▁An atom ica ▁( J NA ) ▁contained ▁the ▁incorrect ▁cart il ago ▁thy re o idea , ▁but ▁after ▁a ▁list ▁of ▁recommend ations / cor re ctions ▁was ▁made ▁this ▁was ▁corrected ▁in ▁subsequent ▁ed itions ▁of ▁the ▁J NA . ▁ ▁The ▁variant ▁with ▁thy ro idea ▁( om itting ▁e ▁after ▁th yr ) ▁is ▁a ▁comprom ise ▁for ▁English - spe aking ▁an atom ists , ▁as ▁they ▁have ▁difficulties ▁pron oun cing ▁that ▁specific ▁combination ▁of ▁letters , ▁forcing ▁a ▁greater ▁res embl ance ▁between ▁Latin ▁and ▁English ▁orth ography . ▁Dor land ' s ▁medical ▁dictionary ▁from ▁ 1 9 4 8 ▁already ▁adopted ▁this ▁incorrect ▁sp elling ▁with ▁an ▁err one ous ▁reference ▁to ▁the ▁official ▁Bas le ▁Nom ina ▁An atom ica ▁even ▁before ▁the ▁nom