al·e·vin 
 (
ăl
ə-v
ən)
 n. A newly hatched salmon or trout that is still attached to the yolk sac.
 
[French, from Old French, from Vulgar Latin *adlevīmen, alteration  (influenced by Latin nūtrīmen, nourishment) of Vulgar Latin *adlevāmen, from *adlevāre, to raise (a child, an animal), alteration  (influenced by Late Latin ēlevāre, to raise (a child, an animal)) of Latin allevāre, to lift up : ad-, al-, ad- + levāre, to lift, raise; see  LEVER.]

alevintrout alevin