TESTAL'OGY, noun [Latin testacea, or testa.] The science of testaceous vermes, or of those soft and simple animals which have a testaceous covering; a branch of vermeology. [Words thus formed of two languages are rather anomalous, and the first for its length is very objectionable.]
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI