Entry 1 sense Webster, 1913 Soft-shell · Soft·-shell · IPA 01 a. Having a soft or fragile shell. 1. Having a soft or fragile shell. Phrases & compounds Soft-shell clam — the long clam. See Mya. Soft-shelled crab — See the Note under Crab, 1. Soft-shelled turtle — Same as Soft tortoise, under Soft.