perforated hole
71perforate — verb (T) 1 to make a hole or holes in something: A broken rib had perforated her lung. 2 (usually passive) to make a line of small holes in a piece of paper so that a part of it can be torn off easily perforated adjective: a perforated sheet of… …
72Quern-stone — The upper stone of a Scottish hand quern from Dalgarven Mill, North Ayrshire. Quern stones are stone tools for hand grinding a wide variety of materials. They were used in pairs. The lower, stationary, stone is called a quern, whilst the upper,… …
73Darning — Cashmere darn , a fine darning technique for twill fabric, from The Dictionary of Needlework, 1885 …
74keyboard instrument — ▪ music Introduction any musical instrument on which different notes can be sounded by pressing a series of keys, push buttons, or parallel levers. In nearly all cases in Western music the keys correspond to consecutive notes in the… …
75Lumber — Timber redirects here. For other uses, see Timber (disambiguation). Timber in storage for later processing at a sawmill …
76Seismic retrofit — Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. Other retrofit techniques are applicable to areas subject to tropical cyclones,… …
77Pipe (instrument) — Infobox Instrument name=Pipe names= classification= *Wind *Woodwind range=1 2 octaves related= *Tinwhistle *Recorder *Galoubet musicians= articles=Pipe describes a number of musical instruments, historically referring to perforated wind… …
78optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …
79military technology — Introduction range of weapons, equipment, structures, and vehicles used specifically for the purpose of fighting. It includes the knowledge required to construct such technology, to employ it in combat, and to repair and replenish it.… …
80General surgery — This page is about the surgical specialty. For the goregrind band, see General Surgery (band) General surgery, despite its name, is a surgical specialty that focuses on abdominal organs, e.g. intestines including esophagus, stomach, colon, liver …
