Pallial sinus. (Zoöl.) See under Pallial.Sinus venosus[L., venous dilatation.] (Anat.) (a) The main part of the cavity of the right auricle of the heart in the higher vertebrates. (b) In the lower vertebrates, a distinct chamber of the heart formed by the union of the large systematic veins and opening into the auricle.

(Si"nus*oid) n. [Sinus + - oid.] (Geom.) The curve whose ordinates are proportional to the sines of the abscissas, the equation of the curve being y = a sin x. It is also called the curve of sines.

(Si`nus*oid"al) a. (Geom.) Of or pertaining to a sinusoid; like a sinusoid.

(Sio"goon) n. See Shogun.

(Sio*goon"ate) n. See Shogunate.

(Sioux) n. sing. & pl. (Ethnol.) See Dakotas.

(Sip) v. t. [imp. & p. p. Sipped (sipt); p. pr. & vb. n. Sipping.] [OE. sippen; akin to OD. sippen, and AS. supan to sip, suck up, drink. See Sup, v. t.]

1. To drink or imbibe in small quantities; especially, to take in with the lips in small quantities, as a liquid; as, to sip tea. "Every herb that sips the dew." Milton.

2. To draw into the mouth; to suck up; as, a bee sips nectar from the flowers.

3. To taste the liquor of; to drink out of. [Poetic]

They skim the floods, and sip the purple flowers.

(Sip), v. i. To drink a small quantity; to take a fluid with the lips; to take a sip or sips of something.

[She] raised it to her mouth with sober grace;
Then, sipping, offered to the next in place.

(Sip), n.

1. The act of sipping; the taking of a liquid with the lips.

2. A small draught taken with the lips; a slight taste.

One sip of this
Will bathe the drooping spirits in delight
Beyond the bliss of dreams.

A sip is all that the public ever care to take from reservoirs of abstract philosophy.
De Quincey.

(Sip"age) n. See Seepage. [Scot. & U.S.]

(Sipe) v. i. See Seep. [Scot. & U.S.]

(Siph"i*lis) n. (Med.) Syphilis.

(Si"phoid) n. [L. sipho a siphon + -oid: cf. F. vase siphoïde.] A siphon bottle. See under Siphon, n.

(Si"phon) n. [F. siphon, L. sipho, -onis, fr. Gr. a siphon, tube, pipe.]

1. A device, consisting of a pipe or tube bent so as to form two branches or legs of unequal length, by which a liquid can be transferred to a lower level, as from one vessel to another, over an intermediate

A sinus may be rounded, as in the leaf of the white oak, or acute, as in that of the red maple.

  By PanEris using Melati.

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