[ahy-suh-pek-tik] /ˌaɪ səˈpɛk tɪk/
a line drawn on a map connecting all points where ice starts to form at approximately the same period at the onset of winter.
[ahy-sop-i-din, ahy-suh-peed-n] /aɪˈsɒp ɪ dɪn, ˌaɪ səˈpid n/ noun, Ichthyology. 1. the underlying layer of a ganoid scale, composed of connective tissue embedded with bone.
[ahy-suh-pen-til] /ˌaɪ səˈpɛn tɪl/ adjective, Chemistry. 1. .
[ahy-soh-puh-rim-i-ter] /ˌaɪ soʊ pəˈrɪm ɪ tər/ noun, Geometry. 1. a figure whose is equal to that of another.
[ahy-soh-puh-rim-i-tree] /ˌaɪ soʊ pəˈrɪm ɪ tri/ noun, Geometry. 1. the study of .