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knife-edge | diffraction
 diffraction
antenn. opt. إنحراف
el. acoust. انحراف الصوتي
light. إنحراف الموجي
med. انْعِراج

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knife edge

['naɪfeʤ]
jewl. Refers to a piece of jewelry wherein the item's metals meet to create a sharp edge. While sharp, the edge is nor sharper than a butter knife.
knife-edge
: 1 phrase in 1 subject
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