shape

鉤虫: velvet worm

unique / peculiar, remarkable; having an uncommon character / exceptional; exceptionally good

uniqueness / peculiarity / exceptionality

ecology, mode of life of living creatures / way of life, the way people live

to know, be aware of / to learn, acquire, / to be acquainted with, to know (someone) / (colloquial, in the negative) to care in the least about, to be concerned with,

stem or continuative form of 知る (shiru) [godan]

Alternative spelling of 物知り: a person with broad knowledge, a knowledgeable person

(mathematics) singularity; singular point

ecology