kēˈtägnəthə noun plural
Usage: capitalized
Etymology: New Latin, from chaet- + -gnatha
: a group of small active transparent marine worms of uncertain systematic position with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth and comprising the arrowworms — see sagitta , spadella
• chae·tog·na·than -thən adjective
• chae·tog·na·thous -thəs adjective