Based on the
http://www.absoluteastronomy.com/topics/Lancetfish
I believe the hint is the heading "Morphology" And thanks to wikipedia, here are some definitions:
# Morphology (linguistics), the study of the structure and content of word forms
# Morphology (biology), the study of the form or shape of an organism or part thereof
# Morphology (astronomy), the shape of astronomical objects such as nebulae, galaxies, or other extended objects
# Morphology (folkloristics), the structure of narratives such as folk tales
# Geomorphology, the study of landforms
# Mathematical morphology, a theoretical model based on lattice theory, used for digital image processing
# River morphology, the field of science dealing with changes of river planform
# Morphological analysis, a general method for non-quantified modelling