Is anchor a word in the Scrabble Dictionary

Yes, anchor is playable

...and is worth 12 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Anchor" Definition

noun

A rigid point of support, as for securing a rope.
A source of security or stability.
An anchorperson.
Nautical A heavy object attached to a vessel by a cable or rope and cast overboard to keep the vessel in place either by its weight or by its flukes, which grip the bottom.
Sports An athlete, usually the strongest member of a team, who performs the last stage of a relay race or other competition.

verb-intransitive

Nautical To drop anchor or lie at anchor.

verb-transitive

Sports To serve as an anchor for (a team or competition).
To hold fast by or as if by an anchor. See Synonyms at fasten.
To narrate or coordinate (a newscast).
To provide or form an anchor store for: Two major stores anchor each end of the shopping mall.

verb

To hold in place in the water by an anchor.
To secure firmly.
To act or serve as an anchor for.
To cast anchor.
To become fixed.