elongate       
 verb [ I or T ] uk/ˈiː.lɒŋ.ɡeɪt/ us/ɪˈlɑːŋ.ɡeɪt/
 (使)变长;(使)延长;(使)变得细长
to become or make something become longer, and often thinner
  The cells elongate as they take in water. 细胞吸水后变长。 
 Synonym: stretch 
Compare: lengthen
 elongate       
adjective  biology specialized uk/ˈiː.lɒŋ.ɡeɪt/ us/ɪˈlɑːŋ.ɡeɪt/
 细长的
having a shape that is much longer than it is wide
  Acanthoclinus are elongate fishes. 棘鮗属鱼的体型都十分细长。