SOAPWORT
soapwort, hedge pink, bouncing Bet, bouncing Bess, Saponaria officinalis
(noun) plant of European origin having pink or white flowers and leaves yielding a detergent when bruised
Source: WordNet® 3.1
Etymology
Noun
soapwort (countable and uncountable, plural soapworts)
Any perennial herb of the genus Saponaria.
Source: Wiktionary
Soap"wort`, n. (Bot.)
Definition: A common plant (Saponaria officinalis) of the Pink family; --
so called because its bruised leaves, when agitated in water, produce
a lather like that from soap. Called also Bouncing Bet.
Source: Webster’s Unabridged Dictionary 1913 Edition