Now and then around the threads, I'll come across the odd word and immediately think "I haven't got a clue what you're talking about". Few and far between fortunately, but often the search function or standard dictionaries are of no help, and I'm sure others share this experience. I thought a thread that would pop up on a search for a fair number of these terms would help particularly newbies, and those for whom English is not their first language. I'll kick things off with Air-ball = failure to create lip vibration when striking a note, resulting in air flow with no sound. Aperture = 'tunnel' of variable length and diameter formed by embouchure for exhalation and pertinent vibrations. Armstrong = high range technique based primarily on contraction of the biceps; see Pressure. (The) Basics Sheet = see http://www.trumpetmaster.com/vb/f136/basics-sheet-69326.html#post662891 BFB = big full breath. Biff = see Clam. Blanched = see Dead tone Blast = play at a volume beyond ones ability to control tone and pitch. Bone = trombone - preferred fallback for failed trumpeters. Breath attack = untongued articulation using the syllable "hoo" Bright = quality of sound rich in harmonic overtones. Choke = fail miserably during a solo or performance; shut off air flow. Circle of breath = see http://www.trumpetmaster.com/vb/f131/advice-my-instructor-79492-6.html#post795148 Clam = general term for a mistake, missed accidental or rhythm etc. Colour = character of a sound due to the higher harmonic overtones, and various stylistic technical effects. Compact = sound with moderate Core (q.v.) and little peripheral Spread (q.v.) Compression = reduction of lung volume due to muscular contraction of various anatomical parts. Core = concerning the clarity and resonance of the lowest harmonics of a sound. Cornet = small horn. Cut (through) = emphasise a line with a non-blending tone rather than sheer volume - see Laser Tone Dark = quality of sound rich in the Core (q.v.) tones. Dead tone = executed without vibrato. (with) Derby = muted effect using a bowler hat. DHC = "Double High C" - space above the 5th leger line over the treble stave. Doit = upward glissando. Embrochure = misspelling of embouchure typical of those who read brochures but not books. f = forty pace pain threshold. ff = square of f (q.v.) Flub = see Clam. Flugel = small tuba. Focused = Compact (q.v.) sound with narrow Core (q.v.) Frankenhorn = instrument cobbled together from parts of various other models. Gap = clearance between end of mouthpiece shank and lead pipe with mysterious, unknowable properties. Growl = onomatopœic, highly coloured tonal effect. Heft = a 'weighty' tone - sonorous and authoritative. Impedance = a measure of the minimum extra 'effort' required to raise loudness one unit at a given pitch. IPA = 91 vol% solution of isopropyl alcohol - useful for sterilising inside tubing etc. It! = any pathetic, embarrassing or shameful affliction; see N+1. KTM = k-tongue modified - a popular modern tonguing technique. Lamp = low quality or otherwise unserviceable instrument. Laser tone = penetrating, very Focused (q.v.) sound with limited tonal Colour (q.v.) Lick = a small phrase, generally undeveloped, that someone enjoys playing. mf = (in style of) Maynard Ferguson - loud, up an octave and add a lip trill. mp = mighty powerful. N+1 = one more trumpet to add to the collection; also a certifiable addictive condition that craves N+1. N+2 = acute case of N+1 (q.v.) Nail it = successfully execute (e.g.) a challenging high note. Noodle = to play groups of random notes, perhaps in search of a Lick (q.v.) or theme. Oboe = an ill wind no-one blows any good. Octave key = hook mounted on leadpipe for small finger - often used to extend range via Pressure (q.v.) Open = with no valves depressed; alternatively, presenting low Impedance (q.v.) p = powerful. Pinky hook = see Octave key Plop = downward glissando. Pop = precisely articulated slur; alternatively, post-concert beverage. pp = pretty powerful. Premature articulation = an entry made too early, with likely risk of Train wreck (q.v.) Pressure = force of mouthpiece against embouchure - often applied excessively for range extension. Projection = capability of making oneself clearly audible at a distance. Resistance = grossly misleading malapropism for Impedance (q.v.) Resonance = the core sound strength of an instrument played in sympathy with it's natural harmonics. Ray of power = see http://www.trumpetmaster.com/vb/f131/breathing-40529-2.html#post379527 Reverse(d) lead pipe = a lead pipe that extends as a leg within a main tuning slide sleeve. Scat = stylised imitation of vocalist who has forgotten his lyrics - characteristic style of Satchmo. Screamer = mouthpiece designed specifically to assist extended playing in extreme register. Sizzle = onomatopœic quality of some Bright (q.v.) sounds, perhaps including tonal distortion. Slot = low impedance 'sweet spot' - may be narrow, wide, more or less close to pitch intended. Spitball = balled up paper etc. blown through trumpet to clean inside tubing. Spread = the more peripheral, diffuse elements in a sound. Stradivarious = predominantly Bach-based Frankenhorn (q.v.) Stuffy = presenting a high Impedance (q.v.) Tacet = musical passage in which trumpets are silent due to excessive difficulty, boredom, bar visit, death etc. Train wreck = collapse of an ensemble performance due to a catastrophically misplayed phrase. TSO = "Trumpet Shaped Object" - cheaply made instrument of limited musical capability. Tuneritis = Degenerative affliction caused by believing electronics and ignoring one's ear. Viola = more vile. Violist = most vile. Welly it = play in unrestrained fashion - see ff. Zombie = resurrected old thread. If you're sure of the appropriate meaning of these terms, or can think of others that should be added to the list, please post/discuss below so I can update this posting. We obviously don't need non-trumpet related definitions of these words. That's what dictionaries are for.