Advertisement

Advertisement

planarian

[ pluh-nair-ee-uhn ]

noun

, Zoology.
  1. any of various free-swimming, mostly freshwater flatworms of the class Turbellaria, having an undulating or sluglike motion: popular in laboratory studies for the ability to regenerate lost parts.


planarian

/ pləˈnɛərɪən /

noun

  1. any free-living turbellarian flatworm of the mostly aquatic suborder Tricladida, having a three-branched intestine


planarian

/ plə-nârē-ən /

  1. Any of various small, chiefly freshwater flatworms of the class Turbellaria, having soft, broad, ciliated bodies shaped like a leaf. Planarians have a mouth on their lower side that is often closer to the tail than the head, and a three-branched digestive cavity. If a planarian is cut into several pieces, each piece can grow into a whole new organism.


Discover More

Word History and Origins

Origin of planarian1

1885–60; < New Latin Planari ( a ) a flatworm genus (noun use of feminine of Late Latin plānārius level, on level ground; taken to mean “flat”; plane 1, -ary + -an

Discover More

Word History and Origins

Origin of planarian1

C19: from New Latin Plānāria type genus, from Late Latin plānārius level, flat; see plane 1

Discover More

Example Sentences

Chromatic jamming appears to be key to how the planarian brain comes together, guiding single cells into neighborhoods that are a driving force in organ development, he says.

Slice a planarian into pieces and, within a week or two, each chunk will grow into a new flatworm — head and all.

Wang uses statistical physics to figure out how planarians regenerate entire organs cell by cell.

Flat against the stone and not easily perceived may be a chiton, a planarian worm, or a nudibranch.

It is now nearly forty years since the presence of chlorophyl in certain species of planarian worms was recognized by Schultze.

Among the lowest forms of worms are the Planarian worms, already alluded to as examples of the third grade of animal existence.

These are planarian worms, and though not of prepossessing appearance generally, are extremely interesting animals to study.

The planarian worms that I have just been telling about are monsters.

Advertisement

Word of the Day

axolotl

[ak-suh-lot-l ]

Meaning and examples

Start each day with the Word of the Day in your inbox!

By clicking "Sign Up", you are accepting Dictionary.com Terms & Conditions and Privacy Policies.

Advertisement

Advertisement

Advertisement


planarplanar process