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blade (n.)

Old English blæd "a leaf," also "a leaf-like part" (of a spade, oar, etc.), from Proto-Germanic *bladaz (source also of Old Frisian bled "leaf," German Blatt, Old Saxon, Danish, Dutch blad, Old Norse blað), from PIE *bhle-to-, suffixed form (past participle) of root *bhel- (3) "to thrive, bloom."

Extended in Middle English to the broad, flattened bone of the shoulder (c. 1300) and the cutting part of knives and swords (early 14c.). The modern use in reference to grass may be a Middle English revival, by influence of Old French bled "corn, wheat" (11c.), which is perhaps from Germanic. The cognate in German, Blatt, is the general word for "leaf;" Laub is used collectively as "foliage." Old Norse blað was used of herbs and plants, lauf in reference to trees. This might have been the original distinction in Old English, too. Compare leaf (n.). Of men from 1590s; in later use often a reference to 18c. gallants and dashing rakes, but the original exact sense, and thus signification, is uncertain.

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Definitions of blade from WordNet

blade (n.)
especially a leaf of grass or the broad portion of a leaf as distinct from the petiole;
Synonyms: leaf blade
blade (n.)
a dashing young man;
gay young blades bragged of their amorous adventures
blade (n.)
something long and thin resembling a blade of grass;
a blade of lint on his suit
blade (n.)
a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard;
Synonyms: sword / brand / steel
blade (n.)
a cut of beef from the shoulder blade;
blade (n.)
a broad flat body part (as of the shoulder or tongue);
blade (n.)
the part of the skate that slides on the ice;
blade (n.)
flat surface that rotates and pushes against air or water;
Synonyms: vane
blade (n.)
the flat part of a tool or weapon that (usually) has a cutting edge;
From wordnet.princeton.edu