Capillary In Spanish

Say “capilar” (ka-pee-LAR) for the blood vessel — the same word works for hair-thin tubes in physics and describes broken capillaries on your face.

You’re reading a Spanish health article and hit “capilar.” Maybe you’re describing a spider vein to a nurse in Madrid, or you need to tell a pharmacist in Mexico City about the tiny red lines on your cheeks. One word covers capillary, but the context matters more than you’d think.

The Spanish word for capillary — “capilar” — is a masculine noun that stays simple in translation but branches into several useful directions. This guide walks through the most common uses, the science behind the term, and how to avoid mixing it up with related blood vessel vocabulary you’ll run into at the doctor’s office.

Where “Capilar” Fits in the Body’s Roadmap

Your circulatory system has three kinds of vessels. Arteries (arterias) push blood away from the heart. Veins (venas) carry it back. Capillaries — “capilares” in Spanish — are the tiny bridges that connect them.

The Clínica Universidad de Navarra medical dictionary defines a capilar as a small-caliber blood vessel located between the terminal branches of arterioles and venules. Its diameter is about 5 to 10 micrometers — roughly one-tenth the width of a human hair.

Spanish-language biology separates capilares from arterias by wall thickness and function. The MSD Manual explains that through the thin walls of capillaries, oxygen and nutrients pass to tissues while carbon dioxide and waste move back into the blood. Arteries, by contrast, are thick and muscular.

Why the Word Feels Familiar but Slippery

English speakers see “capilar” and think “capillary” — which is perfect for the blood vessel. But the Spanish word doubles as an adjective meaning “hair-like” or “filiform.” That dual role trips up learners who assume it only lives in medical context.

The same root shows up in several common phrases that behave differently depending on the setting:

• Vaso capilar: The more specific medical term for a capillary vessel. Literally “capillary vessel.” You’ll see this in anatomy textbooks and diagnostic reports.
• Tubo capilar: A capillary tube used in physics or chemistry. Refers to any narrow glass or plastic tube, not the body.
• Capilaridad: Capillarity — a property of liquids related to surface tension inside narrow spaces. Used in science class, not the clinic.
• Capilares rotos: Broken capillaries. The everyday phrase for spider veins or facial redness that sends English speakers searching for “capillary in Spanish” in the first place.

Using “Capilar” Correctly in Medical and Everyday Spanish

When a Spanish doctor says “capilar,” they almost always mean a blood vessel. The NCI’s capillary definition NCI describes it as the smallest type of blood vessel, connecting an arteriole to a venule — and that matches exactly what “capilar” conveys in Spanish-language cancer care.

But outside the exam room, “capilar” pops up in phrases about skin care (“capilares faciales”), plumbing (“tubo capilar”), and even hair treatments — where the meaning shifts to “hair-related” because capilar also traces back to the Latin capillus (hair). That’s the tricky part. Context decides the meaning.

The Cambridge Dictionary confirms both the anatomical and physical senses, and Reverso’s dictionary flags the adjective use directly. So if you hear “producto capilar” in a Colombian pharmacy, it likely means a hair product — not something for your blood vessels.

Notice the last row. “Producto capilar” uses capilar as an adjective, not a noun. That’s the same word doing double duty. You’d never guess it from context alone, which is why reading the surrounding sentence is your best bet.

How to Recognize and Use Common “Capilar” Phrases

Your brain wants to plug an English meaning into a Spanish sentence. For capilar, that works most of the time — but the exceptions matter more than the rule. Here are three situations where knowing the specific phrase saves the conversation.

1. In a pharmacy for broken capillaries: Say “tengo capilares rotos” (I have broken capillaries). The pharmacist will understand facial redness or spider veins. Don’t say “vasos capilares rotos” — it’s technically correct but sounds overly formal for the counter.
2. At the doctor describing circulation: Use “capilares” alone. “Me preocupa la circulación en los capilares” (I’m worried about circulation in the capillaries). The Spanish Wikipedia entry on capilares sanguíneos notes the wall has just one layer of endothelial cells, which explains why these vessels are so fragile.
3. In a science or engineering class: Specify “tubo capilar” for capillary tube and “capilaridad” for the action of liquid climbing a narrow space. WordReference flags both terms, and they don’t overlap with the blood-vessel meaning.

The Visible Body Spanish resource states that capillaries surround the body’s cells and tissues to supply and absorb oxygen, nutrients, and other substances. If you’re in a medical setting, that’s the concept you’re describing — and “capilar” covers it cleanly.

The Science Behind Capillaries: Size, Function, and Key Terms

Spanish medical terminology mirrors English closely for the circulatory system, but the capillary vocabulary deserves special attention because it overlaps with hair products and physics. The Kenhub anatomy resource lists “vasos capilares” as small structures containing blood that connect arterioles with venules.

According to Spanish translation capillary sources, “capilares sistémicos” refers to systemic capillaries, which act as connection points between arteries and veins in the circulatory system. The distinction matters because pulmonary capillaries serve the lungs while systemic capillaries serve the rest of the body.

The exchange happening in these tiny vessels is the same in any language: oxygen leaves the blood for the tissues, and carbon dioxide moves from tissues into the blood. The Fisioterapia Online glossary describes capilares as the bridge where that exchange of dióxido de carbono with oxígeno takes place.

The Bottom Line

“Capilar” translates “capillary” directly for blood vessels and physics tubes, but its adjective form shifts to “hair-related” in beauty contexts. Stick with “vaso capilar” when precision matters at the doctor’s office, and use “tubo capilar” for lab equipment. For broken capillaries on your face, “capilares rotos” is the everyday phrase Spanish speakers use.

A certified Spanish teacher (DELE, ELE) or a medical interpreter specializing in Spanish can help you practice these distinctions through role-play conversations — especially useful if your goal is to navigate clinics or pharmacies in Spain or Latin America with confidence.