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Webster 1913 Edition

Noun.

One who lurks.

A small fishing boat.

[Prov. Eng.]

Noun.

One that lurks or keeps out of sight.

lurker ‎(plural lurkers)

Agent noun of lurk; one who lurks.
1. (Internet) A user who observes a community rather than participating; someone who reads or takes advantage of content on a website, newsgroup, etc. but does not contribute.
(archaic, Britain, dialect) A small fishing-boat.

someone who lurks

someone who observes a community