theca

Theca is a related term of thecium.

As nouns the difference between thecium and theca

is that thecium is the hymenium while theca is any external case or sheath.

As nouns the difference between polyp and theca

is that polyp is polyp while theca is (biology) any external case or sheath.

In coral science|lang=en terms the difference between corallite and theca

is that corallite is (coral science) the hard outer cup of a coral polyp while theca is (coral science) the calcareous wall of a corallite, the exoskeleton of a coral polyp.

As nouns the difference between corallite and theca

is that corallite is (coral science) the hard outer cup of a coral polyp while theca is (biology) any external case or sheath.

As an adjective calcareous

is resembling or containing calcium carbonate or limestone; chalky.

As a noun theca is

(biology) any external case or sheath.

As nouns the difference between dinoflagellate and theca

is that dinoflagellate is any of many marine protozoa, of the phylum dinoflagellata, that have two flagella while theca is (biology) any external case or sheath.

As nouns the difference between diatom and theca

is that diatom is a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class class: Diatomophyceae or division Bacillariophyta, formerly all included in the order order: Diatomaceae, now obsolete while theca is any external case or sheath.

As nouns the difference between plankton and theca

is that plankton is plankton while theca is (biology) any external case or sheath.

In botany|lang=en terms the difference between anther and theca

is that anther is (botany) the pollen-bearing part of the stamen of a flower while theca is (botany) the pollen producing organ usually found in pairs and forming an anther.

As nouns the difference between anther and theca

is that anther is (botany) the pollen-bearing part of the stamen of a flower while theca is (biology) any external case or sheath.

As nouns the difference between pollen and theca

is that pollen is while theca is (biology) any external case or sheath.

As nouns the difference between sheath and theca

is that sheath is a scabbard; a holster for a sword while theca is (biology) any external case or sheath.

As a verb sheath

is to put an object (especially a weapon, in particular, a sword) into its sheath.