prostomiumn.

Brit.

/prəʊˈstəʊmɪəm/, U.S.

/proʊˈstoʊmiəm/

Inflections: Plural prostomia.

Origin: A borrowing from Greek, combined with an English element, combined with a Latin element. Etymons: pro- prefix², Greek στόμα, Latin -ium.

Etymology: < pro- prefix² + ancient Greek στόμα mouth (see stoma n.) + classical Latin -ium (see -y suffix⁴). Compare ancient Greek προστόμιον mouth, especially of a river, in Hellenistic Greek also joining of the lips. Compare slightly later peristomium n. 2.

Zoology.

In various invertebrates: a part of the body situated in front of or anterior to the mouth; esp. (in annelid worms) the lobe or region anterior to the mouth (and to the first metameric segment), which in polychaetes contains the brain and bears eyes and sensory appendages. Cf. peristomium n. 2.

ΘΚΠ

the world > animals > invertebrates > bodies or parts > [noun] > pre-oral region

prostomium1870

the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > mouth or epiglottis

prestomium1870

prostomium1870

furcula1887

thyroglossal duct1909

1870 H. A. Nicholson Man. Zool. I. xxv. 149 There is always a considerable portion of the body situated in front of the mouth, constituting the so-called ‘præ-oral region’, or ‘prostomium’.

1898 Middletown (N.Y.) Daily Argus 23 June 2/1 He [sc. the earthworm] examines it carefully..with his little upper lip, which the scientists call prostomium. This lip is very sensitive.

1930 H. G. Newth Marshall & Hurst's Junior Course Pract. Zool. (ed. 11) vi. 69 The prostomium, or cephalic lobe, is the rounded lobe forming the extreme anterior end of the worm.

1963 R. P. Dales Annelids 15 The terebellids..have a mass of extensile tentacles arising medusa-like from the prostomium.

2004 Biol. Bull. 206 66/2 Peripheral sensory structures have also been observed on the feeding palps, prostomia, and peristomia of several spionid polychaete species.

Derivatives

† prostomiate adj. Obsolete rare provided with a prostomium; characterized by the presence of a prostomium.

ΘΚΠ

the world > animals > invertebrates > bodies or parts > [adjective] > relating to pre-oral region > having pre-oral region

prostomiate1886

the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [adjective] > mouth

archaeostomatous1876

prostomial1879

prostomiate1886

1886 Encycl. Brit. XXI. 6/1 The development of a prostomiate condition.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).

单词	prostomium
释义	prostomiumn. Brit. /prəʊˈstəʊmɪəm/, U.S. /proʊˈstoʊmiəm/ Inflections: Plural prostomia. Origin: A borrowing from Greek, combined with an English element, combined with a Latin element. Etymons: pro- prefix², Greek στόμα, Latin -ium. Etymology: < pro- prefix² + ancient Greek στόμα mouth (see stoma n.) + classical Latin -ium (see -y suffix⁴). Compare ancient Greek προστόμιον mouth, especially of a river, in Hellenistic Greek also joining of the lips. Compare slightly later peristomium n. 2. Zoology. In various invertebrates: a part of the body situated in front of or anterior to the mouth; esp. (in annelid worms) the lobe or region anterior to the mouth (and to the first metameric segment), which in polychaetes contains the brain and bears eyes and sensory appendages. Cf. peristomium n. 2. ΘΚΠ the world > animals > invertebrates > bodies or parts > [noun] > pre-oral region prostomium1870 the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > mouth or epiglottis prestomium1870 prostomium1870 furcula1887 thyroglossal duct1909 1870 H. A. Nicholson Man. Zool. I. xxv. 149 There is always a considerable portion of the body situated in front of the mouth, constituting the so-called ‘præ-oral region’, or ‘prostomium’. 1898 Middletown (N.Y.) Daily Argus 23 June 2/1 He [sc. the earthworm] examines it carefully..with his little upper lip, which the scientists call prostomium. This lip is very sensitive. 1930 H. G. Newth Marshall & Hurst's Junior Course Pract. Zool. (ed. 11) vi. 69 The prostomium, or cephalic lobe, is the rounded lobe forming the extreme anterior end of the worm. 1963 R. P. Dales Annelids 15 The terebellids..have a mass of extensile tentacles arising medusa-like from the prostomium. 2004 Biol. Bull. 206 66/2 Peripheral sensory structures have also been observed on the feeding palps, prostomia, and peristomia of several spionid polychaete species. Derivatives † prostomiate adj. Obsolete rare provided with a prostomium; characterized by the presence of a prostomium. ΘΚΠ the world > animals > invertebrates > bodies or parts > [adjective] > relating to pre-oral region > having pre-oral region prostomiate1886 the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [adjective] > mouth archaeostomatous1876 prostomial1879 prostomiate1886 1886 Encycl. Brit. XXI. 6/1 The development of a prostomiate condition. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022). < n.1870
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