thecal

IPA/ˈθiː.kəl/
IPA/ˈθiː.kəl/

thecal — adjective

  • thecalpositive
  • more thecalcomparative
  • most thecalsuperlative

1. connected with a covering layer that surrounds and protects part of a body or or

1.adjectiveC2
Definition

connected with a covering layer that surrounds and protects part of a body or organism.

Example

The MRI showed pressure on the thecal sac near Mei's lower back.

collocation: thecal sac

During surgery, the team protected the thecal layer around the nerve roots.

collocation: thecal layer

Common collocations
  • thecal sac
  • thecal layer
  • thecal cells
  • thecal tissue
Synonyms
  • capsular

    used for capsule-like coverings and is not limited to a theca

  • membranous

    broader and can describe any thin membrane, not a specific protective sheath

  • follicular

    more specific to follicles and does not always imply the protective outer layer

Grammar Patterns

thecal + sac

thecal + layer

thecal + cells

thecal + tissue

Usage Note

Mostly used before nouns in anatomy and medical writing, especially with sac, layer, cells, and tissue. To name the covering itself, use the noun theca rather than the adjective thecal.

Common Mistakes

The scan showed damage to the thecal.
The scan showed damage to the thecal sac.
thecal is an adjective and usually needs a following noun.
The biopsy examined the theca cells.
The biopsy examined the thecal cells.
theca names the sheath itself, while thecal describes something related to that sheath.

Word family

  • theca
    nounC2
  • intrathecal
    adjectiveC2

Synonym discussion

Sense: adjective/1

Thecal is used for something that belongs to or forms a specific protective sheath in anatomy. Capsular is close when a structure has a capsule, but it is broader and often used for joints, organs, or bacteria. Membranous is broader still and only says something is like a membrane, without pointing to a named sheath. Follicular relates to a follicle as a whole, while thecal focuses on the outer covering layer around it. Compare a thecal sac around the spinal cord, a capsular tear in a joint, and a membranous wall inside an organ.

capsularmembranousfollicular

Etymology

GreekNew LatinEnglish

Thecal comes from the noun theca, a scientific word for a case or sheath that covers something. Theca entered modern scientific English through New Latin from Greek, where it meant a case or container. English then added the ending -al to make an adjective meaning 'relating to a theca' or 'forming such a covering.'

First known use

1666

1666, in the meaning defined above