The hiragana syllable ろ (ro). Its equivalent in katakana is ロ (ro). It is the forty-third syllable in the gojūon order; its position is ら行お段 (ra-gyō o-dan, “row ra, section o”).

炉: furnace, kiln

(endearing) denotes endearment

論: theory, argument, view

論理: logic

ロシア, 露西亜, 魯西亜: Russia (country)

六角柱: hexagonal prism

書籍: book

Alternative form of 爺ちゃん (jī-chan, “grandpa; granddaddy; old man”)

(dialectal) Clipping of じっちゃん (jitchan, “grandpa; granddaddy; old man”).