The term "loggerhead" primarily refers to the loggerhead sea turtle, scientifically known as Caretta caretta, which is a tropical species distinguished by its hard shell and notable large head. This species is commonly recognized for its beauty and role in marine ecosystems. In a different context, 'loggerhead' can colloquially describe a foolish person or blockhead, highlighting a lack of intelligence or awareness.

Additionally, the phrase "at loggerheads" indicates a state of disagreement or conflict, emphasizing a quarrelsome relationship between individuals. In Mary Alice Monroe's book "The Beach House," these themes of struggle and conflict could play a significant role, reflecting the dynamics between characters as they navigate their relationships amidst the backdrop of nature and personal growth.