| pass | 1. An opening, road, or track, available for passing; especially, one through or over some dangerous or otherwise impracticable barrier; a passageway; a defile; a ford; as, a mountain pass. ""Try not the pass!" the old man said." (Longfellow) 2. A thrust or push; an attempt to stab or strike an adversary. 3. A movement of the hand over or along anything; the manipulation of a mesmerist. 4. A single passage of a bar, rail, sheet, etc, between the rolls. 5. State of things; condition; predicament. "Have his daughters brought him to this pass." (Shak) "Matters have been brought to this pass." (South) 6. Permission or license to pass, or to go and come; a psssport; a ticket permitting free transit or admission; as, a railroad or theater pass; a military pass. "A ship sailing under the flag and pass of an enemy." (Kent) 7. A thrust; a sally of wit. 8. Estimation; character. "Common speech gives him a worthy pass." (Shak) 9. [Cf. Passus] A part; a division. Pass boat, a wooden or metallic box, used to carry cartridges from the service magazine to the piece. Pass check, a ticket of admission to a place of entertainment, or of readmission for one who goes away in expectation of returning. Origin: Cf. F. Pas (for sense 1), and passe, fr. Passer to pass. See Pass. Source: Websters Dictionary (01 Mar 1998) |
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| passacaglio | An old Italian or Spanish dance tune, in slow three-four measure, with divisions on a ground bass, resembling a chaconne. Origin: Sp. Pasacalle a certain tune on the guitar, prop, a tune played in passing through the streets. Source: Websters Dictionary (01 Mar 1998) |
| passage | 1. An evacuation of the bowels. 2. <procedure> The introduction of a catheter, probe, sound or bougie through a natural channel such as the urethra. (18 Nov 1997) |
| Passalurus ambiguus | The rabbit pinworm, an oxyurid nematode found abundantly in the caecum and large intestine of rabbits. (05 Mar 2000) |
| Passavant's bar | A prominence on the posterior wall of the naso-pharynx formed by contraction of the superior constrictor of the pharynx during swallowing. Synonym: Passavant's bar, Passavant's pad, Passavant's ridge. (05 Mar 2000) |
| Passavant's cushion | A prominence on the posterior wall of the naso-pharynx formed by contraction of the superior constrictor of the pharynx during swallowing. Synonym: Passavant's bar, Passavant's pad, Passavant's ridge. (05 Mar 2000) |
| Passavant's pad | A prominence on the posterior wall of the naso-pharynx formed by contraction of the superior constrictor of the pharynx during swallowing. Synonym: Passavant's bar, Passavant's pad, Passavant's ridge. (05 Mar 2000) |
| Passavant's ridge | A prominence on the posterior wall of the naso-pharynx formed by contraction of the superior constrictor of the pharynx during swallowing. Synonym: Passavant's bar, Passavant's pad, Passavant's ridge. (05 Mar 2000) |
| Passavant, Philippas | <person> German physician, 1815-1893. See: Passavant's bar, Passavant's cushion, Passavant's pad, Passavant's ridge. (05 Mar 2000) |
| passe partout | 1. That by which one can pass anywhere; a safe-conduct. 2. A master key; a latchkey. 3. A light picture frame or mat of cardboard, wood, or the like, usually put between the picture and the glass, and sometimes serving for several pictures. Origin: F, from passer to pass + partout everywhere. Source: Websters Dictionary (01 Mar 1998) |
| passenger | 1. A passer or passer-by; a wayfarer. 2. A traveler by some established conveyance, as a coach, steamboat, railroad train, etc. <zoology> Passenger falcon, the common wild pigeon of North America (Ectopistes migratorius), so called on account of its extensive migrations. Origin: OE. & F. Passager. See Passage, and cf. Messenger. Source: Websters Dictionary (01 Mar 1998) |
| passeres | <ornithology> An order, or suborder, of birds, including more that half of all the known species. It embraces all singing birds (Oscines), together with many other small perching birds. Origin: NL, fr. L. Passer a sparrow. Source: Websters Dictionary (01 Mar 1998) |
| passeriform | <zoology> Like or belonging to the Passeres. Source: Websters Dictionary (01 Mar 1998) |
| passerine | <zoology> Of or pertaining to the Passeres. "The columbine, gallinaceous, and passerine tribes people the fruit trees." (Sydney Smith) Origin: L. Passerinus, fr. Passer a sparrow. <zoology> One of the Passeres. Source: Websters Dictionary (01 Mar 1998) |
| Passey, R | <person> 20th century British pathologist. See: Harding-Passey melanoma. (05 Mar 2000) |
| ventriculography, first-pass | Radionuclide ventriculography where a bolus of radionuclide is injected and data are recorded from one pass through the heart ventricle. Left and right ventricular function can be analyzed independently during this technique. First-pass ventriculography is preferred over gated blood pool imaging for assessing right ventricular function. (12 Dec 1998) |
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| high-pass filter | A device or material that allows high frequency signals to pass while attenuating other signals. (05 Mar 2000) |
| low-pass filter | A device or material with the opposite effect from a high-pass filter; most tissues act as low-pass filters of ultrasound signals. (05 Mar 2000) |