os externumn.

Brit.

/ˌɒs ᵻkˈstəːnəm/,

/ˌɒs ɛkˈstəːnəm/, U.S.

/ˌɑs ɪkˈstərn(ə)m/

Origin: A borrowing from Latin. Etymon: Latin os externum.

Etymology: < post-classical Latin os externum (1666 or earlier) < classical Latin ōs os n.³ + externum , neuter of externus outer (see extern adj. and n.).

Anatomy. Now rare.

Originally: † the external opening of the vagina (obsolete). In later use: the opening of the cervix into the vagina; the os uteri.

ΚΠ

1752 W. Smellie Treat. Midwifery I. 92 The Frænum or Fourchette, which bounds the inferior part of the Fossa magna and Os externum.

1752 W. Smellie Treat. Midwifery I. 95 The entry of the vagina is commonly called the Sphincter vaginæ, and the mouth of the womb..os tincæ: but..I shall, in order to avoid confusion.., call the first Os externum, and the other Os internum, through the whole book.

1784 Med. Communications 2 12 The protrusion had entirely retracted within the os externum.

1859 Todd's Cycl. Anat. & Physiol. V. 626/1 The os externum is bordered in front and behind by two smooth lips.

1978 Fertility & Sterility 29 144 In the trials, no motile spermatozoa could be found in any samples obtained from the vagina, the os externum, or the cervical canal immediately after intercourse protected with the new agent.

This is a new entry (OED Third Edition, September 2004; most recently modified version published online June 2022).

单词	os externum
释义	os externumn. Brit. /ˌɒs ᵻkˈstəːnəm/, /ˌɒs ɛkˈstəːnəm/, U.S. /ˌɑs ɪkˈstərn(ə)m/ Origin: A borrowing from Latin. Etymon: Latin os externum. Etymology: < post-classical Latin os externum (1666 or earlier) < classical Latin ōs os n.³ + externum , neuter of externus outer (see extern adj. and n.). Anatomy. Now rare. Originally: † the external opening of the vagina (obsolete). In later use: the opening of the cervix into the vagina; the os uteri. ΚΠ 1752 W. Smellie Treat. Midwifery I. 92 The Frænum or Fourchette, which bounds the inferior part of the Fossa magna and Os externum. 1752 W. Smellie Treat. Midwifery I. 95 The entry of the vagina is commonly called the Sphincter vaginæ, and the mouth of the womb..os tincæ: but..I shall, in order to avoid confusion.., call the first Os externum, and the other Os internum, through the whole book. 1784 Med. Communications 2 12 The protrusion had entirely retracted within the os externum. 1859 Todd's Cycl. Anat. & Physiol. V. 626/1 The os externum is bordered in front and behind by two smooth lips. 1978 Fertility & Sterility 29 144 In the trials, no motile spermatozoa could be found in any samples obtained from the vagina, the os externum, or the cervical canal immediately after intercourse protected with the new agent. This is a new entry (OED Third Edition, September 2004; most recently modified version published online June 2022). < n.1752
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