r, radius

circumference, newtonian telescope, micrometre, arcsecond, micrometres, width, thickness, microns, micrometers, radii, inch, centimeter, millimeter, toroidal, ellipsoid, countersink, angstroms, millionths, thicknesses, tubelike, tetrahedron, retroreflector, apertures, toroid, internodes, muzzle velocity, volute, absorption coefficient, umbels, cryostat, condyle, ellipse, lapilli, flanges, conic, reamer, sepal, mandrel, corrugation, torus, parabolic reflector, pencil eraser, protrusion, collimator, microbalance, embroidery hoop, petiole, pinna, annular, caliper, widthwise, radome, size, venturi, curvature, spheroids, sheave, radial, cubic centimeter, isosceles triangle, pentlandite, lengthwise, radula, dipole moment, veinlet, tokamak, cuboid, corium, perforations, lamellae, azimuthal, dowel, convex lens, kinematic viscosity, racemes, nanometers, anal fin, nozzles, lengthways, refracting telescope, velocities, diaphysis, frustum, ovipositor, fruitlets, femora, cubit, acetabulum, baseplate, rotor, hypabyssal, maxillary, axial, pontil, milliampere, tragus, sphericity, windings, sprue, blebs, impeller, basilar artery, diameters, radius, depth, length, distance, height, lengths, wavelength, widths, diam, spacing, wattage, weight, amount, interval, steel, largediameter, stainless, smalldiameter, uncoated, cylindrical, slotted, lucite, alloy, cm, insulated, mm, noncircular, tapered, coated, galvanised, galvanized, grooved, hollow

bore, caliber, calibre, windage

., .22 caliber, .22 calibre, .38 caliber, .38 calibre, .45 caliber, .45 calibre, amorphophallus titanum, antipodal, antipodal opposition, biauricular, bore, caliber, calibre, caliper, calliper, calvatia gigantea, capillary, capillary tube, capillary tubing, chamaecyparis lawsoniana, chlorophyllum molybdites, close-grained, diametral, diametric, diametrical, diametrically, diametrical opposition, draw, elves, equatorial, fat, fetometry, filamentlike, filamentous, filiform, fine, fine-grained, focal ratio, foetometry, fresnel lens, frisbee, f number, gauge, giant, giant puffball, giant star, hairlike, hockey puck, iris, iris diaphragm, krubi, lawson's cedar, lawson's cypress, ligne, microcyte, neolentinus ponderosus, oblate, oregon cedar, pi, polar, port orford cedar, prolate, puck, pumpkin-shaped, pushball, reducer, red giant, red giant star, speed, stock, stop number, stovepipe, supergiant, tenuous, threadlike, thready, through, titan arum, tower, vasoconstriction, watermelon-shaped, windage, wire gage, wire gauge

straight line