What does OS stand for?

Opening Snap (mitral valve)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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On Schedule On-Site Onboard Software One Side Online Services Only Son Open Skies treaty Open Sockets (Diablo II gaming) Open Source Open Systems		Operating Standard Operating Statement Operating Strength Operating System Operational Security Operational Suitability Operational Superintendence (on overtime forms) Operationalizing the Strategy Operations Specialist (USN Rating) Operations Squadron

Samples in periodicals archive:

Jacquizz Rodgers, who had 186 yards and two scores last year against USC, talked trash to the Trojans defense from the opening snap, but sat out the second quarter with an injured right ankle.

No. 4 USC holds off Oregon St. in wild 42-36 win

On its first drive beginning on its own 3, the Musketeers' nearly fumbled away the opening snap, followed by a 2-yard run by Edmonson, two penalties and a near-interception.

MUSKETEERS GROUND PANTHERS PREP FOOTBALL: MOORPARK'S GAME PLAN OF ...

Then again, Ahmu was available in the third quarter, when Jahvid Best ran 86 yards on an "iso" play similar to the one when he trucked 80 yards on Cal's opening snap of the game.

Thrashing signals start of long road for Cougs

He was needed from the opening snap, yet he sat until the second half.

VICTORY DOESN'T BRING ANSWERS ON DORRELL

Like the Beavers, Oregon will also start a sophomore quarterback, but it will be the third game taking the opening snap for Dennis Dixon.

A BATTLEGROUND ADVANTAGE

Nesbitt threw his first pick on the Yellow Jackets' opening snap, but that was about the only thing they did wrong at the beginning.

No. 15 GT blows lead, rallies past Clemson 30-27

That was demonstrated immediately when Venice senior Ken Ashley took the opening snap and sprinted 83 yards for the touchdown and a 6-0 lead with 16 seconds elapsed.

LOYOLA HAS IT TOUGHER IN VICTORY LOYOLA 28, VENICE 13

The first surprise of the game came when junior quarterback Lonzell Maddock took the opening snap and proceeded to run the Vikings' offense with considerable composure.

Emotional Beach rolls early, beats 4A Wilson Nonleague football