What is "anarthrous"

Anarthrous \An*ar"throus\, a. [Gr. 'a`narqros without joints, without the article; 'an priv. + 'a`rqron joint, the article.]

1. (Gr. Gram.) Used without the article; as, an anarthrous substantive.

2. (Zo["o]l.) Without joints, or having the joints indistinct, as some insects. [1913 Webster] ||

a. 1 (context linguistics English) Not having an article (especially of Greek nouns). 2 (context linguistics English) Not having a determiner. 3 (context biology of a limb English) Not having joints. 4 (context biology of an organism English) Not having legs, wings, or other limbs.