How to say "tic" in Japanese

• チック
  nounThe direct loanword for a tic — a sudden, involuntary twitch or repeated movement. When English 'tic' refers to that kind of nervous spasm rather than a full convulsion, this is the word you want.
• 炭化チタンたんかチタン
  nounThis is titanium carbide, the chemical compound TiC — it matches 'tic' only through the formula's abbreviation, not through any sense of the English word. Reach for it only when writing about the compound itself.
• 痙攣けいれん
  noun, suru verb, intransitive verbChiefly a convulsion, cramp or spasm — a strong involuntary muscular contraction. It can be used for a tic, but for a small repeated twitch it usually sounds too strong; チック is the closer fit.
  この薬くすりを飲のむと胃いの痙攣けいれんが治なおります。↗

  This medicine will ease your cramps.

Use 「チック」 for the involuntary twitch or repeated movement that English calls a tic; 痙攣 means convulsion or cramp and only loosely covers tics; 「炭化チタン」 is titanium carbide (TiC), a chemistry term with no tic sense.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• チックtic
• 炭化チタンたんかチタンtitanium carbide
• 痙攣けいれんconvulsion