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si·lenc·er noun : a device for muffling the noise of a gunshot

si·lent adjective 1 : not speaking : MUTE; also : not inclined to talk

2 : free from sound or noise : STILL, QUIET

3 : performed or borne without utterance

— si·lent·ly adverb

Synonyms

[1] dumb, mum, mute, speechless, uncommunicative; also inarticulate, tongue-tied; nonvocal, voiceless

Antonyms

communicative, speaking, talking

[1] closemouthed, laconic, reserved, reticent, taciturn, uncommunicative; also inhibited, introverted, restrained; sedate, self-contained, sober, staid

Antonyms

chatty, communicative, conversational, gabby, garrulous, loquacious, talkative, unreserved

[2] hushed, muted, noiseless, quiet, soundless, still; also peaceful, tranquil

Antonyms

noisy, unquiet

1silhouette noun [ORIGIN: F]

1 : a representation of the outlines of an object filled in with black or some other uniform color

2 : the outline of a body viewed as circumscribing a mass : OUTLINE <~ of a ship>

Synonyms

contour, figure, outline—more at OUTLINE

2silhouette verb -ett·ed; -ett·ing : to represent by a silhouette; also : to show against a light background

Synonyms

define, delineate, outline, sketch, trace—more at OUTLINE

sil·i·ca noun : a mineral that consists of silicon and oxygen

sil·i·cate noun : a chemical salt that consists of a metal combined with silicon and oxygen

si·li·ceous also si·li·cious adjective : of, relating to, or containing silica or a silicate

sil·i·con noun : a nonmetallic chemical element that occurs in combination as the most abundant element next to oxygen in the earth's crust and is used esp. in alloys and semiconductors

sil·i·cone noun : an organic silicon compound used esp. for lubricants and varnishes

sil·i·co·sis noun : a lung disease caused by prolonged inhaling of silica dusts

silk noun 1 : a fine strong lustrous protein fiber produced by insect larvae usu. for their cocoons; especially : one from moth larvae (silk*worms) used for cloth

2 : thread or cloth made from silk

silk·en adjective : resembling silk (as in texture or appearance)

Synonyms

cottony, downy, satiny, soft, velvety—more at SOFT

silk screen noun : a stencil process in which coloring matter is forced through the meshes of a prepared silk or organdy screen; also : a print made by this process

— silk–screen verb

silky adjective : resembling silk (as in texture or appearance)

sill noun : a heavy crosspiece (as of wood or stone) that forms the bottom member of a window frame or a doorway; also : a horizontal supporting piece at the base of a structure

sil·li·ness noun : the quality or state of being silly; also : a silly practice

Synonyms

absurdity, asininity, balminess, craziness, daftness, fatuity, folly, foolishness, inanity, insanity, lunacy, madness, nonsense, simplicity, zaniness

sil·ly adjective sil·li·er; -est [ORIGIN: ME sely, silly happy, innocent, pitiable, feeble, fr. OE sǣlig, fr. sǣl happiness]

: exhibiting or indicative of a lack of common sense or sound judgment; also : lacking in seriousness

Synonyms

absurd, asinine, balmy, daft, fatuous, foolish, harebrained, kooky, lunatic, mad, nonsensical, nutty, preposterous, sappy, screwball, senseless, stupid, unwise, wacky, witless, zany—more at FOOLISH

flighty, frivolous, giddy, goofy, harebrained, light-headed, scatterbrained—more at GIDDY

si·lo noun, plural silos [ORIGIN: Sp]

1 : a trench, pit, or esp. a tall cylinder for making and storing silage

2 : an underground structure for housing a guided missile

1silt noun 1 : fine earth; especially : particles of such soil floating in rivers, ponds, or lakes

2 : a deposit (as by a river) of silt

— silty adjective

2silt verb : to obstruct or cover with silt

— silt·ation noun

Si·lu·ri·an adjective : of, relating to, or being the period of the Paleozoic era between the Ordovician and the Devonian marked by the appearance of the first land plants