(often passive, slang) To attack by surprise; to subject to a sneak attack. / (often passive, slang, rare) To take rudely by surprise.

A deep water harbor on Oahu, Hawaii. / A US Navy base at the harbor. / The attack on Pearl Harbor.

a very large, but harmless, bacterium, Thiomargarita namibiensis, that grows as a string of white beads large enough to be visible to the naked eye in the coastal sediments of Namibia

The pearl oyster.

(idiomatic, derogatory) Prim, prudish, or easily offended.

plural of pearl body

(biology) A small, lustrous, pearl-like food body produced from the epidermis of leaves, petioles and shoots of certain plants, sought after by various arthropods and ants.

plural of pearl wedding

A thirtieth wedding anniversary.

(vulgar, slang, of a female) To masturbate by clitoral stimulation.