theca

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

is that theca is (botany) the pollen producing organ usually found in pairs and forming an anther while frustule is (botany) the siliceous shell of a diatom.

As nouns the difference between theca and frustule

is that theca is (biology) any external case or sheath while frustule is (botany) the siliceous shell of a diatom.

As nouns the difference between thecia and theca

is that thecia is plural of thecium while theca is any external case or sheath.

As nouns the difference between terms and theca

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

As nouns the difference between thecae and theca

is that thecae is plural of theca while theca is any external case or sheath.

As nouns the difference between theta and theca

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

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

is that theca is (botany) the pollen producing organ usually found in pairs and forming an anther while tetrathecal is (botany) having four thecae.

As a noun theca

is (biology) any external case or sheath.

As an adjective tetrathecal is

(botany) having four thecae.

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

is that theca is (botany) the pollen producing organ usually found in pairs and forming an anther while angiosporous is (botany) having spores contained in cells or thecae.

As a noun theca

is (biology) any external case or sheath.

As an adjective angiosporous is

(botany) having spores contained in cells or thecae.

In microbiology|planktology|lang=en terms the difference between theca and epitheca

is that theca is (microbiology|planktology) the membrane complex enveloping the cells of certain plankton including diatoms and dinoflagellates while epitheca is (microbiology|planktology) the upper half of the theca of a thecate protist such as a diatom or dinoflagellate.

As nouns the difference between theca and epitheca

is that theca is (biology) any external case or sheath while epitheca is (microbiology|planktology) the upper half of the theca of a thecate protist such as a diatom or dinoflagellate.

As a noun theca

is (biology) any external case or sheath.

As an adjective thecal is

of or pertaining to a theca.

In biology|lang=en terms the difference between theca and thecate

is that theca is (biology) any external case or sheath while thecate is (biology) having a theca, or outer sheath.

As a noun theca

is (biology) any external case or sheath.

As an adjective thecate is

(biology) having a theca, or outer sheath.