词根词缀：deon-, deont-

【来源及含义】Greek: duty, that which is binding; obligation; necessity

【同源单词】deontic, deontic logic, deontological, deontological ethics, deontologism, deontologist

词根词缀：-ics, -tics [-ac after i]

【来源及含义】Greek: a suffix that forms nouns and is usually used to form names of arts and sciences

【同源单词】acoustics, acoustoelectronics, acousto-optic, actinogenics, actinotherapeutics, actinotherapy