词根：acid, acri, acrid, acu = sour, sharp, 表示“尖, 酸, 锐利”

acid 酸的

acidify 酸化（acid+ify…化→酸化）

acidity 酸度，酸性（acid+ity性质→酸性）

acidulous 微酸的（acid+ulous有…的→有酸味的）

acrid 辛辣的；类刻的（acrimony的形容词）

acute 尖锐的，敏锐的

acuity 尖锐，敏锐（acu+ity性质→尖的性质→尖锐）

acumen 敏锐，聪明（acu+men表示名词→尖→敏锐）

acupuncture 针炙（acu尖＋punct点＋ure→用尖〔针〕点→针炙）

acme 顶点，顶峰（acumen的变体）

词根词缀：acerb-, acerbo-; acri-, acrid-

【来源及含义】Latin: bitter, sharp, sour, stinging

【相关描述】Formed from a blend of Latin acer- (feminine acris, neuter acre) which are both related to Latin acus, "needle"; acies, "sharp edge, point, the front of an army, line of battle, battle array"; and acuere, "to sharpen".

【相关词根词缀】 Cross references of word families that are related directly, or indirectly, to: "sour, sharp": aceto-; acid-; acies- (not "sour"); acuto- (not "sour"); oxy-; pung- (not "sour").

【同源单词】acerbate, acerbic, acerbity, acerbophobia, acerophobia, acerose

词根词缀：acrido-, acrid-, acris-

【来源及含义】Greek: grasshopper, grasshoppers; locust, locusts; cricket, crickets

【同源单词】Acridid, Acrididae, Acrididae, acridids, acridology, acridophage