tides

tide¹

T0206500 (tīd)n.1. a. The periodic variation in the surface level of the oceans and of bays, gulfs, inlets, and estuaries, caused by gravitational attraction of the moon and sun.b. A specific occurrence of such a variation: awaiting the next high tide.c. Flood tide.2. Tidal force.3. a. Something that increases, decreases, or fluctuates like the waters of the tide: a rising tide of skepticism; the shifting tide of the battle.b. A large amount or number moving or occurring in a mass: an incoming tide of immigrants; a tide of angry letters.c. A surge of emotion: felt an irresistible tide of sympathy for the defendant. See Synonyms at flow.4. A time or season. Often used in combination: eventide; Christmastide; Shrovetide.5. A favorable occasion; an opportunity.v. tid·ed, tid·ing, tides v.intr.1. To rise and fall like the tide.2. Nautical To drift or ride with the tide: tided off the reef; tiding up the Hudson.v.tr. To carry along with the tide.Phrasal Verb: tide over To support through a difficult period: I asked for $100 to tide me over till payday.

[Middle English, from Old English tīd, division of time; see dā- in Indo-European roots.]

tide²

T0206500 (tīd)intr.v. tid·ed, tid·ing, tides Archaic To betide; befall.

[Middle English tiden, from Old English tīdan; see dā- in Indo-European roots.]

tides

river estuary - The mouth of a river that is influenced by the tides.
ebb - Suggests the receding of something (e.g. tides) that commonly comes and goes.
riptide - Is actually a current, not a tide.
canonical hours - The seven canonical hours of the church were called tides, and tide—from an Indo-European root meaning "to divide"—is used with other words to denote a definite interval of time: noontide, Eastertide, eventide, summertide, etc.

tides

The regular rise and fall of sea level mainly due to the Moon’s gravitational pull on the Earth.

Translations

maree

tides

Tides: (a)(i) gravitational acceleration on Earth due to Moon, (ii) differential (tidal) acceleration found by subtracting a from other vectors on Fig. (1); (b) spring (top) and neap tides

tides

Distortions of a planet, star, etc., produced by the differential gravitational attraction of other astronomical bodies on parts of that planet, star, etc. The Sun and Moon combine to generate two tidal bulges in the Earth's oceans, one directed toward the Moon and the other diametrically opposite. If the Earth is assumed to be spherical and to be covered with water, then the gravitational pull of the Moon will have a different force at different points on the Earth's surface (see illustration (a)(i)). The gravitational acceleration at the Earth's center is equal to the centripetal acceleration of the Earth–Moon system. If this acceleration (which is a vector quantity) is subtracted from the surface accelerations, the differential (tidal) acceleration is found (illustration (a)(ii)), showing the two tidal bulges on the Earth–Moon line.

The daily rotation of the Earth and the slower eastward revolution of the Moon in its orbit produce (usually) two high tides and two low tides every 24 hours 50 minutes. The rotation and lunar revolution are also responsible for a tidal lag between the time when the Moon crosses the local meridian and the time of high tide.

The tidal pull of the Sun is less than half that of the Moon but reinforces it at full Moon and at new Moon to produce very high, or spring tides; these tides are exceptionally high when the Earth is close to perihelion and the Moon is close to perigee (see illustration (b)). The lowest high tides, or neap tides, occur when the Moon is at quadrature. The tidal height depends on the topography of the coastline and on the area of the adjacent continental shelf. Tides are also generated in the Earth's atmosphere and in the solid Earth.

Lunar tides are raised by the Earth as a consequence of the Moon's eccentric orbit. They trigger moonquakes and transient lunar phenomena. See also tidal friction.

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TIDES

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