A mushroom in genus Suillus, family Boletaceae, especially Suillus luteus; boletes, they have no gills, but release spores from tubes ending in open pores.

(idiomatic) A valuable feature (of software etc) overlooked by the user.

(uncountable) The property of being slippery. / (countable) The result or product of being slippery.

(US) An upholstered chair with a low seat and a high back.

Any achelate (clawless) decapod crustacean of the family Scyllaridae.

a type of orchid; a lady's slipper

(simile, colloquial) So slippery that it is almost impossible to hold. / (idiomatic, simile, colloquial) Very crafty or cunning.

plural of slipperiness

plural of slippery slope

superlative form of slippery: most slippery