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3 : an extensive depression in the land surface

sink·er noun : a weight for sinking a fishing line or net

sink·hole noun : a hollow place in which drainage collects

sin·ner noun : one that sins

Synonyms

evildoer, malefactor, wrongdoer—more at EVILDOER

si·nol·o·gy noun, often cap : the study of the Chinese and esp. their language, history, and culture

— si·no·log·i·cal adjective, often cap

— si·nol·o·gist noun, often cap

sin tax noun : a tax on substances or activities considered sinful or harmful

sin·u·ous adjective : bending in and out : WINDING

— sin·u·os·i·ty noun

— sin·u·ous·ly adverb

Synonyms

crooked, devious, serpentine, tortuous, winding—more at CROOKED

si·nus noun [ORIGIN: ME, fr. ML, fr. L, curve, hollow]

1 : any of several cavities of the skull usu. connecting with the nostrils

2 : a space forming a channel (as for the passage of blood)

si·nus·itis noun : inflammation of a sinus of the skull

Sioux noun, plural Sioux [ORIGIN: AmerF, short for Nadouessioux, fr. Ojibwa na·towe·ssiw-, prob. fr. Algonquian *a·towe·- speak another language]

: DAKOTA

1sip verb sipped; sip·ping : to drink in small quantities

2sip noun : a small draft taken with the lips

1siphon also syphon noun 1 : a bent tube through which a liquid can be transferred by means of air pressure up and over the edge of one container and into another container placed at a lower level

2 usually sy·phon : a bottle that ejects soda water through a tube when a valve is opened

2siphon verb si·phoned; si·phon·ing : to draw off by or as if by means of a siphon

Synonyms

channel, conduct, direct, funnel, pipe—more at CHANNEL

sir noun [ORIGIN: ME sir, sire, fr. AF, lord, feudal superior, fr. VL *seior, alter. of L senior, compar. of senex old, old man]

1 : a man of rank or position — used as a title before the given name of a knight or baronet

2 — used as a usu. respectful form of address

Si·rach noun : a book of the Roman Catholic canon of the Old Testament

1sire noun 1 : FATHER; also archaic : FOREFATHER

2 archaic : LORD — used as a form of address and a title

3 : the male parent of an animal (as a horse or dog)

2sire verb sired; sir·ing : to procreate as the father : BEGET

si·ren noun 1 : a seductive or alluring woman

2 : an electrically operated device for producing a loud shrill warning signal

— siren adjective

sir·loin noun [ORIGIN: alter. of earlier surloin, modif. of MF surlonge, fr. sur over (fr. L super) + longe loin]

: a cut of beef taken from the part in front of the round

sirup variant of SYRUP

si·sal noun : a strong cordage fiber from an agave; also : this agave

sis·sy noun, plural sissies 1 : an effeminate boy or man

2 : a timid or cowardly person

Synonyms

chicken, coward, craven, dastard, poltroon, recreant—more at COWARD

sis·ter noun 1 : a female having one or both parents in common with another individual

2 : a member of a religious order of women : NUN

3 chiefly British : NURSE

4 : a girl or woman regarded as a comrade

— sis·ter·ly adjective

sis·ter·hood noun 1 : the state of being a sister

2 : a community or society of sisters

3 : the solidarity of women based on shared conditions

sis·ter–in–law noun, plural sisters–in–law : the sister of one's spouse; also : the wife of one's brother

sit verb sat ; sit·ting 1 : to rest upon the buttocks or haunches

2 : ROOST, PERCH

3 : to occupy a seat

4 : to hold a session

5 : to cover eggs for hatching : BROOD

6 : to pose for a portrait

7 : to remain quiet or inactive

8 : FIT

9 : to cause (oneself) to be seated

10 : to place in position

11 : to keep one's seat on <~ a horse>

12 : BABYSIT

13 : to occupy a position

Synonyms

[5] brood, hatch, incubate, set—more at SET

[13] be, lie, stand

si·tar noun [ORIGIN: Hindi & Urdu sitār]

: an Indian lute with a long neck and a varying number of strings

sit·com noun : SITUATION COMEDY

site noun 1 : the spatial location of