thread·fin 
(thrĕdfĭn′)
(thrĕdfĭn′)n. pl. threadfin or thread·fins
Any of various chiefly tropical marine fishes of the family Polynemidae, having threadlike rays extending from the lower part of the pectoral fin.
- circulatory system
- circum-
- circumambience
- circumambiency
- circumambient
- circumambiently
- circumambulate
- circumambulation
- circumboreal
- circumcise
- circumciser
- circumcision
- circumduction
- circumference
- circumferential
- circumfix
- circumflex
- circumfluent
- circumfluous
- circumfuse
- circumfusion
- circumjacent
- circumlocution
- circumlocutorily
- circumlocutory