Definition of buttock line in English:

buttock line

Line breaks: but|tock line

Entry from British & World English dictionary

noun

Each of a series of longitudinal lines or curves marked on a plan of a ship to show its fore-and-aft sections at various distances from the centre line.

Definition of buttock line in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily