Meaning
The kanji 燥 (SOU, kawa.ku, kawa.kasu) primarily means dryness, aridity, or being parched. It describes a state of lacking moisture or being dried out, often by heat or air. Unlike some other kanji for 'dry,' 燥 frequently implies a more intense, sometimes uncomfortable, dryness, especially when referring to climate, skin, or other environmental conditions.
Its etymology provides valuable clues to its meaning. The kanji 燥 is a semantic-phonetic compound. The left-hand radical, 火 (hi, hihen), represents 'fire.' This semantic component strongly indicates heat or burning as the agent of drying, visually linking the kanji to the process of desiccation by warmth. The right-hand component, 噪 (SOU), primarily functions as the phonetic component, guiding its on'yomi reading to 'SOU'. While 噪 independently means 'chirping,' 'noise,' or 'clamor,' its presence here might subtly evoke the brittle, rustling sounds associated with extreme dryness. Alternatively, it may simply indicate the sound without direct semantic contribution in this context.
This combination of 'fire' and the phonetic element clearly illustrates the concept: fire causes dryness. The kanji consists of 17 strokes, reflecting its relatively complex visual structure. As an N2 level kanji, it is not taught in elementary school grades (hence listed as grade 0) but is essential for intermediate to advanced Japanese proficiency, appearing in diverse contexts related to weather, health, and emotional states.
Readings
On'yomi (音読み) — Chinese-derived readings
The on'yomi readings for 燥 are derived from Chinese and are predominantly used in compound words, where 燥 combines with other kanji.
ソウ (SOU): This is the primary on'yomi reading for 燥. It frequently appears in words describing states of dryness, particularly in formal or technical contexts, and also in words conveying agitation or impatience.
乾燥 (kansou) — dryness, dehydration, arid. This is perhaps the most common compound, referring to a general state of being dry.
焦燥 (shousou) — impatience, irritation, fretfulness. This compound combines 焦 (to scorch, to be impatient) with 燥, suggesting a 'scorched' or 'parched' mental state.
燥熱 (sounetsu) — dry heat. This term specifically refers to heat that is dry, often in meteorological or medical contexts.
Kun'yomi (訓読み) — Native Japanese readings
Kun'yomi readings are native Japanese words whose meanings align with the kanji 燥. They are typically used when the kanji stands alone or as part of a verb conjugation.
かわく (kawa.ku): This is an intransitive verb meaning 'to dry (out),' 'to get dry,' or 'to be parched.' It describes a state of becoming dry without an explicit agent performing the action.
手が燥く (te ga kawaku) — My hands get dry.
喉が燥く (nodo ga kawaku) — My throat gets dry/parched.
土が燥く (tsuchi ga kawaku) — The soil dries out.
かわかす (kawa.kasu): This is a transitive verb meaning 'to dry (something),' 'to make something dry,' or 'to air-dry.' It describes the action of causing something to become dry.
髪を燥かす (kami wo kawakasu) — to dry one's hair.
洗濯物を燥かす (sentakumono wo kawakasu) — to dry the laundry.
絵の具を燥かす (enogu wo kawakasu) — to dry the paint.
Common Words & Compounds
Here are some common words and compounds using 燥, categorized for a better understanding of their usage:
General Dryness & Weather:
乾燥 (kansou) — dryness, arid, parched. (e.g., 乾燥地帯 - arid region)
乾燥剤 (kansouzai) — desiccant, drying agent.
乾燥機 (kansouki) — drying machine, dryer (e.g., 洗濯乾燥機 - washer-dryer).
乾燥注意報 (kansou chuuihou) — dryness advisory (weather warning).
高燥 (kousou) — high and dry; referring to land that is elevated and not damp.
Medical & Physical Conditions:
乾燥肌 (kansouhada) — dry skin.
乾燥性 (kansousei) — dryness-related; e.g., 乾燥性湿疹 (kansousei shisshin) - dry eczema.
口が燥く (kuchi ga kawaku) — to have a dry mouth.
Emotional & Mental States:
焦燥 (shousou) — impatience, fretfulness, agitation. Often used to describe a restless or anxious state of mind.
浮燥 (fusou) — frivolous, fickle, flighty (an older or literary term, less common in everyday speech).
Actions:
燥ぐ (hashagu) — to make merry, to frolic, to be in high spirits. (This is a less common, jukujikun reading. Its meaning is not directly related to 'dryness' but rather to boisterous energy.)
Example Sentences
冬は空気が乾燥しますので、加湿器を使いましょう。
Fuyu wa kuuki ga kansou shimasu node, kashitsuki wo tsukaimashou.
Since the air gets dry in winter, let's use a humidifier.
洗濯物を外に燥かすために、天気の良い日を選んだ。
Sentakumono wo soto ni kawakasu tame ni, tenki no yoi hi wo eranda.
I chose a day with good weather to dry the laundry outside.
喉が燥いて水ばかり飲んでいたら、お腹を壊してしまった。
Nodo ga kawaite mizu bakari nonde itara, onaka wo kowashite shimatta.
My throat was parched, and I kept drinking only water, which upset my stomach.
彼女は焦燥感に駆られ、仕事に集中できなかった。
Kanojo wa shousoukan ni karare, shigoto ni shuuchuu dekinakatta.
She was driven by a sense of impatience and couldn't concentrate on her work.
この地域は年間を通して乾燥しており、雨がほとんど降らない。
Kono chiiki wa nenkan wo tooshite kansou shiteori, ame ga hotondo furanai.
This region is dry throughout the year, and it hardly ever rains.
風呂上がりに髪をしっかり燥かしましょう、風邪をひかないように。
Furo agari ni kami wo shikkari kawakashimashou, kaze wo hikanai you ni.
Let's dry your hair thoroughly after a bath, so you don't catch a cold.
乾燥機を使えば、厚手のタオルでも短時間で乾かすことができる。
Kansouki wo tsukaeba, atsude no taoru demo tanjikan de kawakasu koto ga dekiru.
If you use a dryer, even thick towels can be dried in a short time.
夏の強い日差しで地面はすっかり燥いてしまい、ひび割れが目立った。
Natsu no tsuyoi hizashi de jimen wa sukkari kawaite shimai, hibiware ga medatta.
The strong summer sun completely dried out the ground, and prominent cracks appeared.
Memory Tip
To remember 燥, focus on its constituent parts. The left part is the 'fire' radical (火). Fire naturally brings about dryness. Imagine a roaring fire intensely drying everything around it. The right part, 噪, is a phonetic component that gives the 'SOU' reading. You can think of the crackling or rustling 'noise' (噪 can mean noise/chatter) that very dry, brittle objects make when they're moved. This way, 'fire' (火) makes things so 'dry' that they become 'noisy' (噪) when touched. This combination helps link the visual and phonetic elements to the core meaning of intense dryness.