a marked ruler used to measure the number of perforations per unit length along the borders of a stamp.
a graduated scale for measuring perforations and roulettes of postage stamps
[per-fawrs, -fohrs] /pərˈfɔrs, -ˈfoʊrs/ adverb 1. of necessity; necessarily; by force of circumstance: The story must perforce be true. /pəˈfɔːs/ adverb 1. by necessity; unavoidably adv. early 14c., par force, from Old French par force (12c.), literally “by force” (see force). With Latin per substituted 17c. for French cognate par.
[pur-fer-in] /ˈpɜr fər ɪn/ noun, Biochemistry. 1. a protein produced by killer cells of the immune system that causes disintegration of targeted cells by forming pores in their membranes.
[per-fawrm] /pərˈfɔrm/ verb (used with object) 1. to carry out; execute; do: to perform miracles. 2. to go through or execute in the proper, customary, or established manner: to perform the marriage ceremony. 3. to carry into effect; fulfill: Perform what you promise. 4. to act (a play, part, etc.), as on the stage, in […]
[per-fawr-muh ns] /pərˈfɔr məns/ noun 1. a musical, dramatic, or other entertainment presented before an audience. 2. the act of a ceremony, play, piece of music, etc. 3. the execution or accomplishment of work, acts, feats, etc. 4. a particular action, deed, or proceeding. 5. an action or proceeding of an unusual or spectacular kind: […]