A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Fa Fe Fi Fl Fo Fr Fu
Fib Fil Fim Fis

Filum

Noun, pl. fila

1. A filamentous anatomical structure. (wiktionary.org)

2. A threadlike structure (as a chainlike series of cells). (wordnetweb.princeton.edu)

Word origin: From Latin fīlum (“thread”).