"groins" in the noun sense
1. groin, inguen
the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals
a curved edge formed by two intersecting vaults
3. breakwater, groin, groyne, mole, bulwark, seawall, jetty
a protective structure of stone or concrete extends from shore into the water to prevent a beach from washing away
"groins" in the verb sense
build with groins
"The ceiling was groined"
Source: WordNet® (An amazing lexical database of English)
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