'Sliding keel' definitions:

Definition of 'sliding keel'

noun

A retractable fin keel used on sailboats to prevent drifting to leeward [syn: centerboard, centreboard, drop keel, sliding keel]

From: GCIDE

Sliding \Slid"ing\, a.
1. That slides or slips; gliding; moving smoothly. [1913 Webster]
2. Slippery; elusory. [Obs.] [1913 Webster]
That sliding science hath me made so bare. --Chaucer. [1913 Webster]
Sliding friction (Mech.), the resistance one body meets with in sliding along the surface of another, as distinguished from rolling friction.
Sliding gunter (Naut.), a topmast arranged with metallic fittings so as to be hoisted and lowered by means of halyards.
Sliding keel (Naut), a movable keel, similar to a centeboard.
Sliding pair. (Mech.) See the Note under Pair, n., 7.
Sliding rule. Same as Slide rule, under Slide, n.
Sliding scale. (a) A scale for raising or lowering imposts in proportion to the fall or rise of prices. (b) A variable scale of wages or of prices. (c) A slide rule.
Sliding ways (Naut.), the timber guides used in launching a vessel. [1913 Webster]