Dictionary.com
definitions

tectum

[tek-tuh m]

noun, plural tec·tums, tec·ta [tek-tuh] /ˈtɛk tə/. Anatomy, Zoology.

a rooflike structure.

Origin of tectum

1900–05; < New Latin, Latin tēctum roof, special use of neuter of tēctus, past participle of tegere to cover; cf. protect
Related formstec·tal, tec·to·ri·al [tek-tawr-ee-uh l, -tohr-] /tɛkˈtɔr i əl, -ˈtoʊr-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
tecta in Medicine

tectum

[tĕk′təm]

n. pl. tec•ta (-tə)

A rooflike structure of the body, especially the dorsal part of the mesencephalon.
Related formstec′tal (-təl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.