921552 ELU Ease of Language Understanding 21 921561 ELU exponential linear unit 12 921550 ELU ELISA laboratory units 4 921549 ELU ELISA Units 3 921559 ELU endoluminal ultrasound 2 921554 ELU e-learning unit 1 921551 ELU Ecological Land Units 1 921557 ELU elutriate 1 921556 ELU emergency locking unit 1 921558 ELU enzyme-linked immunosorbent units 1 921560 ELU existing land use 1 921562 ELU expired, leftover, or unused 1 921553 ELU Extended Length of Utterance 1 921563 ELU extended linear unit 1 921555 ELU Extraperitoneal laparoscopic urethropexy 1