tusk : Idioms & Phrases
Elephant's tusk
(Zoöl.) , the tooth shell. SeeDentalium .
Webster 1913
elephant-tusk
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noun annual of southern United States to Mexico having large whitish or yellowish flowers mottled with purple and a long curving beak
common unicorn plant; ram's horn; Proboscidea louisianica; devil's claw; common devil's claw; proboscis flower.
WordNet
tusk shell
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noun any of various seashore mollusks having a tapering tubular shell open at each end and a foot pointed like a spade for burrowing
tooth shell.
WordNet
tusk-shell
Tusk"-shell` noun
Definitions
(Zoöl.) See 2d Tusk , n., 2.