prostomium

American  

[proh-stoh-mee-uhm] / proʊˈstoʊ mi əm /

noun

• prostomia
  plural

1. the unsegmented, preoral portion of the head of certain lower invertebrates.

---

prostomium British  

/ prəʊˈstəʊmɪəm /

noun

1. the lobe at the head end of earthworms and other annelids: bears tentacles, palps, etc, or forms part of a sucker or proboscis

---

Other Word Forms

Derived Forms

• prostomial
  adjective

Inflected Forms

Nouns

• prostomia
  plural

---

Etymology

Origin of prostomium

1865–70; < New Latin < Greek prostómion mouth. See pro- ², stoma, -ium

---

Example Sentences

See Examples For:

prostomium

The prostomium bears often processes, both dorsal and ventral, which in the Sabellids are split into the circle of branchial plumes, which surround or nearly surround the mouth in those tube-dwelling Annelids.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" by Various

At the same time the prostomium and its appendages cease to be recognizable as distinct elements of the head.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" by Various

In both, the nephridia are all alike; there are no jaws; the prostomium rarely has processes.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" by Various

The peculiar prostomium of Tomopteris is described below.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" by Various

The prostomium and the segments generally often bear processes sensory and branchial.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" by Various

Random Word

Spin the wheel and learn a new word!

---