Etymology
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platelet (n.)

"a little plate," originally and especially of the disk-shaped corpuscles in mammalian blood, 1895, formed in English from plate (n.) + diminutive suffix -let.

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booklet (n.)
"a small book," 1859, from book (n.) + diminutive ending -let.
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caveat emptor 

1520s, Latin, literally "let the buyer beware;" see caveat and second element of exempt (adj.).

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boomlet (n.)
"small burst of activity, prosperity, etc.," 1880, from boom (n.3) + -let.
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maisonette (n.)

1818, "small house," from French maisonnette, diminutive of maison "house" (11c.), from Latin mansionem (see mansion). Meaning "a part of a building let separately" is by 1889.

You see, this is how it stands: I live in what the fellow who let the thing to me called a "maisonette"—goodness only knows why .... [Windsor Magazine, 1902]
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ludicrous (adj.)

1610s, "pertaining to play or sport" (a sense now obsolete), from Latin ludicrus "sportive" (source of Old French ludicre), from ludicrum "amusement, game, toy, source of amusement, joke," from ludere "to play."

This verb, along with Latin ludus "a game, play," is from the PIE root *leid- or *loid- "to play," perhaps literally "to let go frequently" [de Vaan], which is the source also of Middle Irish laidid "impels;" Greek lindesthai "to contend," lizei "plays;" Albanian lind "gives birth," lindet "is born;" Old Lithuanian leidmi "I let," Lithuanian leisti "to let," laidyti "to throw," Latvian laist "let, publish, set in motion."

Sense of "ridiculous, apt to evoke ridicule or jest" is attested from 1782. Related: Ludicrously; ludicrousness.

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anklet (n.)
"ornamental ring for an ankle," 1810, from ankle, with diminutive suffix -let, after bracelet, etc.
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submit (v.)
late 14c., "to place (oneself) under the control of another, to yield oneself," from Latin submittere "to yield, lower, let down, put under, reduce," from sub "under" (see sub-) + mittere "let go, send" (see mission). Transitive sense of "refer to another for consideration" first recorded 1550s. Related: Submitted; submitting.
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demit (v.)

early 15c., demitten, "to run or flow down," also figurative, "to humble oneself," from Old French demetre "to send, put, or let down," and directly from Latin demittere "to send down," from de "down" (see de-) + mittere "to release, let go; send, throw" (see mission).

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epistaxis (n.)
"nosebleed," 1793, medical Latin, as if from Greek *epistaxis, a false reading for epistagmos, from epi "upon" (see epi-) + stazein "to let fall in drops" (see stalactite).
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