isopedin

[ ahy-sop-i-din, ahy-suh-peed-n ]
/ aɪˈsɒp ɪ dɪn, ˌaɪ səˈpid n /

noun Ichthyology.

the underlying layer of a ganoid scale, composed of connective tissue embedded with bone.
Also i·sop·e·dine [ahy-sop-i-din, -deen, -dahyn] /aɪˈsɒp ɪ dɪn, -ˌdin, -ˌdaɪn/.

Origin of isopedin

iso- + -pedin < Greek pedīnós level