OB

OB (countable and uncountable, plural OBs)

1. (sports) Initialism of Olympic best.

   Coordinate terms: OR, PB, SB, WB

2. (television, radio) Initialism of outside broadcast.
3. Initialism of old boy. (male graduate; also a CB radio operator's term of address for a male)
4. Abbreviation of obstetrician.
   • 1989, Contemporary Obstetrics-gynecology, volume 33, page 200:

     One woman in ten is at risk — yet one-third of all women over 50 have never had a mammo! By making Pap tests routine, OBs and GYNs have saved many lives.

5. Abbreviation of obstetrics.
6. Abbreviation of Old Babylonian.

OB (not comparable)

1. Abbreviation of obstetric.
2. (golf) Initialism of out of bounds.
3. Abbreviation of obligatory. (as in "ob. link" on Usenet) (see ObLink at c2.com; see also ob-)
4. Abbreviation of Old Babylonian.

• OB marker

• BO, Bo, bo

• IPA^(key): /oːˈbeː/

• Audio:

  (file)

OB m (strong, genitive OBs, plural OBs)

1. Abbreviation of Oberbürgermeister.
2. Abbreviation of Oberbefehlshaber.
3. Abbreviation of Oberbootsmann.

From English OB (“old boy”).

OB(オービー) • (ōbī) 

1. male graduate

   Synonym: 卒業生

• OG (OG)

OB

1. (money) Abbreviation of obryzum, pure gold, refined gold.
   • 4th century coinage mint marks:

     CONOB [Constantinopoli obryzum]

     CONOB [pure gold, Constantinople mint]

• PS (pure silver)