Aculeus – Definition & Meaning

Aculeus is a term that is not commonly used in everyday language, but it has a specific meaning in various fields. It is important to understand the definition and meaning of aculeus to comprehend its significance in different contexts.


Aculeus refers to a sharp or pointed appendage or structure that is present in animals or plants. In animals, aculeus can be found in the form of stingers, spines, or thorns. In plants, aculeus is usually in the form of thorns, prickles, or spines.


The word aculeus has its roots in Latin, where it means “sting” or “prickle.” The word has been used in English since the 17th century.

Meaning in different dictionaries

The meaning of aculeus in different dictionaries is consistent with its definition. The Oxford English Dictionary defines aculeus as “a sharp-pointed organ or process, especially a sting or spine.” The Merriam-Webster dictionary defines it as “a sharp-pointed process or organ, especially a sting of an insect or a spine of a fish.”


Aculeus is commonly associated with animals and plants that have defensive mechanisms. For example, bees have a stinger that they use to defend themselves and their hive. Cacti have spines that protect them from predators. Thus, aculeus is often associated with protection and defense.


Synonyms of aculeus include spike, prickle, thorn, spine, barb, and stinger.


Antonyms of aculeus include blunt, dull, and smooth.

The same root words

The same root words as aculeus include acumen, which means “sharpness of mind,” and acuity, which means “sharpness of perception.”

Example Sentences

  1. The bee’s aculeus is used as a defense mechanism.
  2. The cactus has aculeus that protect it from predators.
  3. I accidentally pricked myself on the aculeus of the rose bush.
  4. The fish’s aculeus can be dangerous if not handled properly.
  5. The aculeus of the scorpion is used to inject venom into its prey.
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